diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index 08ae6df5e0b..ace5ef2dbf6 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -127,7 +127,7 @@
   font-weight: bold;
   font-size: inherit;
 }
-.openerp a.button:link, .openerp a.button:visited, .openerp button, .openerp .oe_button, .openerp input[type='submit'], .openerp .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button {
+.openerp a.button:link, .openerp a.button:visited, .openerp button, .openerp .oe_button, .openerp input[type='submit'] {
   display: inline-block;
   border: 1px solid rgba(0, 0, 0, 0.4);
   color: #4c4c4c;
@@ -152,7 +152,7 @@
   -webkit-font-smoothing: antialiased;
   outline: none;
 }
-.openerp a.button:hover, .openerp button:hover, .openerp .oe_button:hover, .openerp input[type='submit']:hover, .openerp .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button.ui-state-hover {
+.openerp a.button:hover, .openerp button:hover, .openerp .oe_button:hover, .openerp input[type='submit']:hover {
   background-color: #ececec;
   background-image: -webkit-gradient(linear, left top, left bottom, from(#f6f6f6), to(#e3e3e3));
   background-image: -webkit-linear-gradient(top, #f6f6f6, #e3e3e3);
@@ -163,7 +163,7 @@
   cursor: pointer;
   background-position: 0;
 }
-.openerp a.button:focus, .openerp button:focus, .openerp .oe_button:focus, .openerp input[type='submit']:focus, .openerp .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button.ui-state-focus {
+.openerp a.button:focus, .openerp button:focus, .openerp .oe_button:focus, .openerp input[type='submit']:focus {
   border: 1px solid #80bfff;
   background-position: 0;
   background-color: #ececec;
@@ -177,7 +177,7 @@
   -webkit-box-shadow: 0 0 3px #80bfff, 0 1px 1px rgba(255, 255, 255, 0.8) inset;
   box-shadow: 0 0 3px #80bfff, 0 1px 1px rgba(255, 255, 255, 0.8) inset;
 }
-.openerp a.button:active, .openerp a.button.active, .openerp button:active, .openerp .oe_button:active, .openerp .oe_button.active, .openerp input[type='submit']:active, .openerp input[type='submit'].active, .openerp .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button.ui-state-active {
+.openerp a.button:active, .openerp a.button.active, .openerp button:active, .openerp .oe_button:active, .openerp .oe_button.active, .openerp input[type='submit']:active, .openerp input[type='submit'].active {
   background-color: #ececec;
   background-image: -webkit-gradient(linear, left top, left bottom, from(#e3e3e3), to(#f6f6f6));
   background-image: -webkit-linear-gradient(top, #e3e3e3, #f6f6f6);
@@ -212,148 +212,6 @@
 .openerp .ui-tabs {
   position: static;
 }
-.openerp.ui-dialog {
-  display: none;
-  height: auto !important;
-  padding: 6px;
-  background-color: rgba(60, 60, 60, 0.7);
-  border: 1px solid;
-  border-color: #888888 #555555 #444444;
-  -moz-border-radius: 8px;
-  -webkit-border-radius: 8px;
-  border-radius: 8px;
-  -moz-box-shadow: 0 1px 12px rgba(0, 0, 0, 0.6);
-  -webkit-box-shadow: 0 1px 12px rgba(0, 0, 0, 0.6);
-  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.6);
-  -webkit-background-clip: padding-box;
-  -moz-background-clip: padding-box;
-  background-clip: padding-box;
-}
-.openerp.ui-dialog .ui-dialog-content {
-  padding: 0;
-}
-.openerp.ui-dialog .ui-dialog-titlebar, .openerp.ui-dialog .ui-dialog-content, .openerp.ui-dialog .ui-dialog-buttonpane {
-  padding: 16px;
-}
-.openerp.ui-dialog .ui-dialog-titlebar {
-  border-top: none;
-  border-left: none;
-  border-right: none;
-  border-bottom: 1px solid #cacaca;
-  -moz-border-radius: 2px 2px 0 0;
-  -webkit-border-radius: 2px 2px 0 0;
-  border-radius: 2px 2px 0 0;
-  background-color: #ededed;
-  background-image: -webkit-gradient(linear, left top, left bottom, from(#fcfcfc), to(#dedede));
-  background-image: -webkit-linear-gradient(top, #fcfcfc, #dedede);
-  background-image: -moz-linear-gradient(top, #fcfcfc, #dedede);
-  background-image: -ms-linear-gradient(top, #fcfcfc, #dedede);
-  background-image: -o-linear-gradient(top, #fcfcfc, #dedede);
-  background-image: linear-gradient(to bottom, #fcfcfc, #dedede);
-}
-.openerp.ui-dialog .ui-dialog-titlebar .ui-dialog-title {
-  margin: 0;
-  padding: 0;
-}
-.openerp.ui-dialog .ui-dialog-content {
-  background: white;
-  width: auto !important;
-}
-.openerp.ui-dialog .ui-dialog-buttonpane {
-  border-top: 1px solid #e0e0e0;
-  background: #f5f7f9;
-  margin: 0;
-  -moz-border-radius: 0 0 2px 2px;
-  -webkit-border-radius: 0 0 2px 2px;
-  border-radius: 0 0 2px 2px;
-}
-.openerp.ui-dialog .ui-dialog-buttonpane button {
-  margin: 0 4px 0 0;
-}
-.openerp.ui-dialog .ui-dialog-buttonpane .ui-dialog-buttonset {
-  float: left;
-}
-.openerp.ui-dialog .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button {
-  margin-right: 4px;
-}
-.openerp.ui-dialog .ui-dialog-titlebar-close {
-  padding: 0;
-}
-.openerp.ui-dialog .ui-dialog-titlebar-close .ui-icon-closethick {
-  display: none;
-}
-.openerp.ui-dialog .ui-dialog-titlebar-close:before {
-  content: "×";
-  font-size: 18px;
-  font-weight: bold;
-  line-height: 16px;
-  color: black;
-  text-shadow: 0 1px 0 white;
-  padding: 0;
-  cursor: pointer;
-  background: transparent;
-  border: 0;
-}
-.openerp.ui-dialog .ui-dialog-titlebar-close:before:hover {
-  color: black;
-  text-decoration: none;
-}
-.openerp.ui-dialog .oe_about {
-  background-color: white;
-  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAGCAYAAADgzO9IAAAAKUlEQVQIHWO8e/fufwYsgAUkJigoiCIF5DMyoYggcUiXgNnBiGQKmAkARpcEQeriln4AAAAASUVORK5CYII=);
-  -moz-border-radius: 0 0 2px 2px;
-  -webkit-border-radius: 0 0 2px 2px;
-  border-radius: 0 0 2px 2px;
-}
-.openerp.ui-dialog .oe_about a {
-  color: #7c7bad;
-}
-.openerp.ui-dialog .oe_about a:hover {
-  text-decoration: underline;
-}
-.openerp.ui-dialog .oe_about a:focus {
-  outline: none;
-}
-.openerp.ui-dialog .oe_about .oe_logo {
-  margin-left: -6px;
-}
-.openerp.ui-dialog .oe_about .oe_bottom {
-  position: absolute;
-  top: 50%;
-  left: 0;
-  right: 0;
-  bottom: 0;
-  text-shadow: 0 1px 1px #999999;
-  background-color: #8a0e0e;
-  background-image: -webkit-gradient(linear, left top, left bottom, from(#b41616), to(#600606));
-  background-image: -webkit-linear-gradient(top, #b41616, #600606);
-  background-image: -moz-linear-gradient(top, #b41616, #600606);
-  background-image: -ms-linear-gradient(top, #b41616, #600606);
-  background-image: -o-linear-gradient(top, #b41616, #600606);
-  background-image: linear-gradient(to bottom, #b41616, #600606);
-  color: #eeeeee;
-  padding: 0 16px;
-  -moz-border-radius: 0 0 2px 2px;
-  -webkit-border-radius: 0 0 2px 2px;
-  border-radius: 0 0 2px 2px;
-}
-.openerp.ui-dialog .oe_about .oe_bottom a {
-  color: #eeeeee;
-}
-.openerp.ui-dialog.oe_act_window .ui-dialog-content {
-  padding: 0px;
-}
-.openerp .modal-backdrop {
-  position: fixed;
-  top: 0;
-  right: 0;
-  bottom: 0;
-  left: 0;
-  z-index: 1040;
-  background-color: black;
-  filter: alpha(opacity=30);
-  opacity: 0.3;
-}
 .openerp .oe_i {
   font-family: "mnmliconsRegular" !important;
   font-size: 21px;
@@ -1233,11 +1091,6 @@
   margin-left: -6px;
 }
 .openerp .oe_about .oe_bottom {
-  position: absolute;
-  top: 50%;
-  left: 0;
-  right: 0;
-  bottom: 0;
   text-shadow: 0 1px 1px #999999;
   background-color: #8a0e0e;
   background-image: -webkit-gradient(linear, left top, left bottom, from(#b41616), to(#600606));
@@ -3425,9 +3278,6 @@ body.oe_single_form .oe_single_form_container {
 .openerp_ie ul.oe_form_status li.oe_active > .arrow span, .openerp_ie ul.oe_form_status_clickable li.oe_active > .arrow span {
   background-color: #729fcf !important;
 }
-.openerp_ie .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button {
-  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#EFEFEF', endColorstr='#D8D8D8');
-}
 
 @media print {
   .openerp {
@@ -3473,7 +3323,19 @@ body.oe_single_form .oe_single_form_container {
   width: 18px;
   height: 18px;
 }
-
+.modal .modal-header button.close {
+  border: none;
+  background: none;
+  padding: 1px;
+  height: 18px;
+  font-size: 20px;
+}
+.modal .modal-footer {
+  text-align: left;
+}
+.modal .oe_act_window.modal-body{
+  padding: 0;
+}
 input[type="radio"], input[type="checkbox"] {
   margin-right: 4px;
   margin-left: 4px;
diff --git a/addons/web/static/src/css/base.sass b/addons/web/static/src/css/base.sass
index 7ebc7408127..c148d95d7b1 100644
--- a/addons/web/static/src/css/base.sass
+++ b/addons/web/static/src/css/base.sass
@@ -218,7 +218,7 @@ $sheet-padding: 16px
         font-size: inherit
     // }}}
     // Button style {{{
-    a.button:link, a.button:visited, button, .oe_button, input[type='submit'], .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button
+    a.button:link, a.button:visited, button, .oe_button, input[type='submit']
         display: inline-block
         border: 1px solid rgba(0,0,0,0.4)
         color: #4c4c4c
@@ -233,18 +233,18 @@ $sheet-padding: 16px
         -webkit-font-smoothing: antialiased
         outline: none
 
-    a.button:hover, button:hover,.oe_button:hover, input[type='submit']:hover, .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button.ui-state-hover
+    a.button:hover, button:hover,.oe_button:hover, input[type='submit']:hover
         @include vertical-gradient(#f6f6f6, #e3e3e3)
         cursor: pointer
         background-position: 0
 
-    a.button:focus, button:focus, .oe_button:focus, input[type='submit']:focus, .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button.ui-state-focus
+    a.button:focus, button:focus, .oe_button:focus, input[type='submit']:focus
         border: 1px solid #80bfff
         background-position: 0
         @include vertical-gradient(#f6f6f6, #e3e3e3)
         @include box-shadow((0 0 3px #80bfff, 0 1px 1px rgba(255, 255, 255, .8) inset))
 
-    a.button:active, a.button.active, button:active, .oe_button:active, .oe_button.active, input[type='submit']:active, input[type='submit'].active, .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button.ui-state-active
+    a.button:active, a.button.active, button:active, .oe_button:active, .oe_button.active, input[type='submit']:active, input[type='submit'].active
         @include vertical-gradient(#e3e3e3, #f6f6f6)
         @include box-shadow(none)
 
@@ -272,105 +272,6 @@ $sheet-padding: 16px
     .ui-tabs
         position: static
 
-    // Modal box
-    &.ui-dialog
-        display: none
-        height: auto !important
-        padding: 6px
-        //overflow: hidden
-        background-color: rgba(60,60,60,0.7)
-        border: 1px solid
-        border-color: #888 #555 #444
-        //overflow: hidden
-        @include radius(8px)
-        @include box-shadow(0 1px 12px rgba(0, 0, 0, 0.6))
-        @include background-clip()
-        .ui-dialog-content
-            padding: 0
-        .ui-dialog-titlebar, .ui-dialog-content, .ui-dialog-buttonpane
-            padding: 16px
-        .ui-dialog-titlebar
-            border-top: none
-            border-left: none
-            border-right: none
-            border-bottom: 1px solid #cacaca
-            @include radius(2px 2px 0 0)
-            @include vertical-gradient(#FCFCFC, #DEDEDE)
-            .ui-dialog-title
-                margin: 0
-                padding: 0
-        .ui-dialog-content
-            background: white
-            width: auto !important
-        .ui-dialog-buttonpane
-            border-top: 1px solid #e0e0e0
-            background: #f5f7f9
-            margin: 0
-            @include radius(0 0 2px 2px)
-            button
-                margin: 0 4px 0 0
-            .ui-dialog-buttonset
-                float: left
-                .ui-button
-                    margin-right: 4px
-        .ui-dialog-titlebar-close
-            padding: 0
-            .ui-icon-closethick
-                display: none
-            &:before
-                content: "×"
-                font-size: 18px
-                font-weight: bold
-                line-height: 16px
-                color: black
-                text-shadow: 0 1px 0 white
-                padding: 0
-                cursor: pointer
-                background: transparent
-                border: 0
-                &:hover
-                    color: black
-                    text-decoration: none
-        .oe_about
-            background-color: white
-            background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAGCAYAAADgzO9IAAAAKUlEQVQIHWO8e/fufwYsgAUkJigoiCIF5DMyoYggcUiXgNnBiGQKmAkARpcEQeriln4AAAAASUVORK5CYII=)
-            @include radius(0 0 2px 2px)
-            a
-                color: $link-color
-                &:hover
-                    text-decoration: underline
-                &:focus
-                    outline: none
-            .oe_logo
-                margin-left: -6px
-            .oe_bottom
-                position: absolute
-                top: 50%
-                left: 0
-                right: 0
-                bottom: 0
-                text-shadow: 0 1px 1px #999999
-                @include vertical-gradient(#b41616, #600606)
-                color: #eee
-                padding: 0 16px
-                @include radius(0 0 2px 2px)
-                a
-                    color: #eee
-
-    &.ui-dialog.oe_act_window
-        .ui-dialog-content
-            padding: 0px
-
-    .modal-backdrop
-        position: fixed
-        top: 0
-        right: 0
-        bottom: 0
-        left: 0
-        z-index: 1040
-        background-color: black
-        @include opacity(.3)
-
     // }}}
     // Generic classes {{{
     .oe_i
@@ -1030,11 +931,6 @@ $sheet-padding: 16px
         .oe_logo
             margin-left: -6px
         .oe_bottom
-            position: absolute
-            top: 50%
-            left: 0
-            right: 0
-            bottom: 0
             text-shadow: 0 1px 1px #999999
             @include vertical-gradient(#b41616, #600606)
             color: #eee
@@ -2764,9 +2660,6 @@ body.oe_single_form
             > .arrow span
                 background-color: #729fcf !important
 
-    // jquery ui for ie
-    .ui-dialog-buttonpane .ui-dialog-buttonset .ui-button
-        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#EFEFEF', endColorstr='#D8D8D8')
 // }}}
 
 // @media print {{{
@@ -2811,6 +2704,19 @@ body.oe_single_form
     height: 18px
 // End hack}}}
 
+// Customized modal according bootstrap3
+.modal
+    .modal-header button.close
+        border: none
+        background: none
+        padding: 1px
+        height: 18px
+        font-size: 20px
+    .modal-footer
+        text-align: left
+    .oe_act_window.modal-body
+        padding: 0
+
 input[type="radio"], input[type="checkbox"]
     margin-right: 4px
     margin-left: 4px
diff --git a/addons/web/static/src/js/chrome.js b/addons/web/static/src/js/chrome.js
index de56927799e..ee88839e656 100644
--- a/addons/web/static/src/js/chrome.js
+++ b/addons/web/static/src/js/chrome.js
@@ -56,16 +56,6 @@ instance.web.action_warn = function(element, action) {
 };
 instance.web.client_actions.add("action_warn", "instance.web.action_warn");
 
-/**
- * The very minimal function everything should call to create a dialog
- * in OpenERP Web Client.
- */
-instance.web.dialog = function(element) {
-    var result = element.dialog.apply(element, _.rest(_.toArray(arguments)));
-    result.dialog("widget").openerpClass();
-    return result;
-};
-
 /**
     A useful class to handle dialogs.
 
@@ -81,6 +71,8 @@ instance.web.Dialog = instance.web.Widget.extend({
         @param {Widget} parent
         @param {dictionary} options A dictionary that will be forwarded to jQueryUI Dialog. Additionaly, that
             dictionary can contain the following keys:
+            - size: one of the following: 'large', 'medium', 'small'
+            - dialogClass: class to add to the body of dialog
             - buttons: Deprecated. The buttons key is not propagated to jQueryUI Dialog. It must be a dictionary (key = button
                 label, value = click handler) or a list of dictionaries (each element in the dictionary is send to the
                 corresponding method of a jQuery element targeting the <button> tag). It is deprecated because all dialogs
@@ -94,57 +86,15 @@ instance.web.Dialog = instance.web.Widget.extend({
         this._super(parent);
         this.content_to_set = content;
         this.dialog_options = {
-            modal: true,
             destroy_on_close: true,
-            width: 900,
-            min_width: 0,
-            max_width: '95%',
-            height: 'auto',
-            min_height: 0,
-            max_height: $(window.top).height() - 200,
-            autoOpen: false,
-            position: [false, 40],
+            size: 'large', //'medium', 'small'
             buttons: null,
-            resizeStop: function() {
-                self.trigger("resized");
-            },
         };
         if (options) {
             _.extend(this.dialog_options, options);
         }
         this.on("closing", this, this._closing);
-        this.$buttons = $('<div class="ui-dialog-buttonpane ui-widget-content ui-helper-clearfix"><span class="oe_dialog_custom_buttons"/></div>');
-    },
-    _get_options: function() {
-        var self = this;
-        var o = _.extend({}, this.dialog_options);
-        var sizes = {
-            width: $(window.top).width(),
-            height: $(window.top).height(),
-        };
-        _.each(sizes, function(available_size, unit) {
-            o[unit] = self._get_size(o[unit], available_size);
-            o['min_' + unit] = self._get_size(o['min_' + unit] || 0, available_size);
-            o['max_' + unit] = self._get_size(o['max_' + unit] || 0, available_size);
-            if (o[unit] !== 'auto' && o['min_' + unit] && o[unit] < o['min_' + unit]) {
-                o[unit] = o['min_' + unit];
-            }
-            if (o[unit] !== 'auto' && o['max_' + unit] && o[unit] > o['max_' + unit]) {
-                o[unit] = o['max_' + unit];
-            }
-        });
-        o.title = o.title || this.dialog_title;
-        return o;
-    },
-    _get_size: function(val, available_size) {
-        val = val.toString();
-        if (val === 'auto') {
-            return val;
-        } else if (val.slice(-1) === "%") {
-            return Math.round(available_size / 100 * parseInt(val.slice(0, -1), 10));
-        } else {
-            return parseInt(val, 10);
-        }
+        this.$buttons = $('<div class="modal-footer"><span class="oe_dialog_custom_buttons"/></div>');
     },
     renderElement: function() {
         if (this.content_to_set) {
@@ -162,8 +112,7 @@ instance.web.Dialog = instance.web.Widget.extend({
         if (!this.dialog_inited) {
             this.init_dialog();
         }
-        this.$el.dialog('open');
-        this.$el.dialog("widget").append(this.$buttons);
+        this.$buttons.insertAfter(this.$dialog_box.find(".modal-body"));
         return this;
     },
     _add_buttons: function(buttons) {
@@ -188,16 +137,39 @@ instance.web.Dialog = instance.web.Widget.extend({
         @return The result returned by start().
     */
     init_dialog: function() {
-        var options = this._get_options();
+        var self = this;
+        var options = _.extend({}, this.dialog_options);
+        options.title = options.title || this.dialog_title;
         if (options.buttons) {
             this._add_buttons(options.buttons);
             delete(options.buttons);
         }
         this.renderElement();
-        instance.web.dialog(this.$el, options);
-        if (options.height === 'auto' && options.max_height) {
-            this.$el.css({ 'max-height': options.max_height, 'overflow-y': 'auto' });
+
+        this.$dialog_box = $(QWeb.render('Dialog', options)).appendTo("body");
+        this.$el.modal({
+            'backdrop': false,
+            'keyboard': true,
+        });
+        if (options.size !== 'large'){
+            var dialog_class_size = this.$dialog_box.find('.modal-lg').removeClass('modal-lg')
+            if (options.size === 'small'){
+                dialog_class_size.addClass('modal-sm');
+            }
         }
+
+        this.$el.appendTo(this.$dialog_box.find(".modal-body"));
+        var $dialog_content = this.$dialog_box.find('.modal-content');
+        if (options.dialogClass){
+            $dialog_content.find(".modal-body").addClass(options.dialogClass);
+        }
+        $dialog_content.openerpClass();
+
+        this.$dialog_box.on('hidden.bs.modal', this, function(){
+            self.trigger("closing");
+        });
+        this.$dialog_box.modal('show');
+
         this.dialog_inited = true;
         var res = this.start();
         return res;
@@ -206,9 +178,8 @@ instance.web.Dialog = instance.web.Widget.extend({
         Closes the popup, if destroy_on_close was passed to the constructor, it is also destroyed.
     */
     close: function(reason) {
-        if (this.dialog_inited && this.$el.is(":data(dialog)")) {
-            this.trigger("closing", reason);
-            this.$el.dialog('close');
+        if (this.dialog_inited && this.$el.is(":data(bs.modal)")) {
+            this.$el.parents('.modal').modal('hide');
         }
     },
     _closing: function() {
@@ -233,8 +204,8 @@ instance.web.Dialog = instance.web.Widget.extend({
             this.close(reason);
             this.__tmp_dialog_destroying = undefined;
         }
-        if (this.dialog_inited && !this.isDestroyed() && this.$el.is(":data(dialog)")) {
-            this.$el.dialog('destroy');
+        if (this.dialog_inited && !this.isDestroyed() && this.$el.is(":data(bs.modal)")) {
+            this.$el.parents('.modal').remove();
         }
         this._super();
     }
@@ -272,12 +243,13 @@ instance.web.CrashManager = instance.web.Class.extend({
         if (error.data.exception_type === "except_osv") {
             error = _.extend({}, error, {data: _.extend({}, error.data, {message: error.data.arguments[0] + "\n\n" + error.data.arguments[1]})});
         }
-        instance.web.dialog($('<div>' + QWeb.render('CrashManager.warning', {error: error}) + '</div>'), {
+        new instance.web.Dialog(this, {
+            size: 'medium',
             title: "OpenERP " + (_.str.capitalize(error.type) || "Warning"),
             buttons: [
-                {text: _t("Ok"), click: function() { $(this).dialog("close"); }}
-            ]
-        });
+                {text: _t("Ok"), click: function() { this.parents('.modal').modal('hide'); }}
+            ],
+        }, $('<div>' + QWeb.render('CrashManager.warning', {error: error}) + '</div>')).open();
     },
     show_error: function(error) {
         if (!this.active) {
@@ -285,17 +257,12 @@ instance.web.CrashManager = instance.web.Class.extend({
         }
         var buttons = {};
         buttons[_t("Ok")] = function() {
-            $(this).dialog("close");
+            this.parents('.modal').modal('hide');
         };
-        var dialog = new instance.web.Dialog(this, {
+        new instance.web.Dialog(this, {
             title: "OpenERP " + _.str.capitalize(error.type),
-            width: '80%',
-            height: '50%',
-            min_width: '800px',
-            min_height: '600px',
             buttons: buttons
-        }).open();
-        dialog.$el.html(QWeb.render('CrashManager.error', {session: instance.session, error: error}));
+        }, QWeb.render('CrashManager.error', {session: instance.session, error: error})).open();
     },
     show_message: function(exception) {
         this.show_error({
@@ -342,16 +309,17 @@ instance.web.RedirectWarningHandler = instance.web.Dialog.extend(instance.web.Ex
         error = this.error;
         error.data.message = error.data.arguments[0];
 
-        instance.web.dialog($('<div>' + QWeb.render('CrashManager.warning', {error: error}) + '</div>'), {
+        new instance.web.Dialog(this, {
+            size: 'medium',
             title: "OpenERP " + (_.str.capitalize(error.type) || "Warning"),
             buttons: [
-                {text: _t("Ok"), click: function() { $(this).dialog("close"); }},
+                {text: _t("Ok"), click: function() { this.$el.parents('.modal').modal('hide'); }},
                 {text: error.data.arguments[2], click: function() {
                     window.location.href='#action='+error.data.arguments[1];
-                    $(this).dialog("close");
+                    this.$el.parents('.modal').modal('hide');
                 }}
-            ]
-        });
+            ],
+        }, QWeb.render('CrashManager.warning', {error: error})).open();
         this.destroy();
     }
 });
@@ -498,13 +466,13 @@ instance.web.DatabaseManager = instance.web.Widget.extend({
      * @param {String} error.error message of the error dialog
      */
     display_error: function (error) {
-        return instance.web.dialog($('<div>'), {
-            modal: true,
+        return new instance.web.Dialog(this, {
+            size: 'medium',
             title: error.title,
             buttons: [
-                {text: _t("Ok"), click: function() { $(this).dialog("close"); }}
+                {text: _t("Ok"), click: function() { this.$el.parents('.modal').modal('hide'); }}
             ]
-        }).html(error.error);
+        }, $('<div>').html(error.error)).open();
     },
     do_create: function(form) {
         var self = this;
@@ -731,13 +699,13 @@ instance.web.ChangePassword =  instance.web.Widget.extend({
        });
     },
     display_error: function (error) {
-        return instance.web.dialog($('<div>'), {
-            modal: true,
+        return new instance.web.Dialog(this, {
+            size: 'medium',
             title: error.title,
             buttons: [
-                {text: _t("Ok"), click: function() { $(this).dialog("close"); }}
+                {text: _t("Ok"), click: function() { this.$el.parents('.modal').modal('hide'); }}
             ]
-        }).html(error.error);
+        }, $('<div>').html(error.error)).open();
     },
 });
 instance.web.client_actions.add("change_password", "instance.web.ChangePassword");
@@ -1052,8 +1020,11 @@ instance.web.UserMenu =  instance.web.Widget.extend({
                 e.preventDefault();
                 window.location = $.param.querystring( window.location.href, 'debug');
             });
-            instance.web.dialog($help, {autoOpen: true,
-                modal: true, width: 507, height: 290, resizable: false, title: _t("About")});
+            new instance.web.Dialog(this, {
+                size: 'medium',
+                dialogClass: 'oe_act_window',
+                title: _t("About"),
+            }, $help).open();
         });
     },
 });
diff --git a/addons/web/static/src/js/data_export.js b/addons/web/static/src/js/data_export.js
index 252a5a378cc..2de933f45e8 100644
--- a/addons/web/static/src/js/data_export.js
+++ b/addons/web/static/src/js/data_export.js
@@ -46,7 +46,6 @@ instance.web.DataExport = instance.web.Dialog.extend({
     start: function() {
         var self = this;
         this._super.apply(this, arguments);
-        self.$el.removeClass('ui-dialog-content ui-widget-content');
 
         var got_fields = new $.Deferred();
         this.$el.find('#import_compat').change(function() {
@@ -413,7 +412,6 @@ instance.web.DataExport = instance.web.Dialog.extend({
         });
     },
     close: function() {
-        this.$el.remove();
         this._super();
     }
 });
diff --git a/addons/web/static/src/js/view_form.js b/addons/web/static/src/js/view_form.js
index 37c60a36f04..83745133a3b 100644
--- a/addons/web/static/src/js/view_form.js
+++ b/addons/web/static/src/js/view_form.js
@@ -586,13 +586,13 @@ instance.web.FormView = instance.web.View.extend(instance.web.form.FieldManagerM
             this._internal_set_values(result.value, processed);
         }
         if (!_.isEmpty(result.warning)) {
-            instance.web.dialog($(QWeb.render("CrashManager.warning", result.warning)), {
+            new instance.web.Dialog(this, {
+                size: 'medium',
                 title:result.warning.title,
-                modal: true,
                 buttons: [
-                    {text: _t("Ok"), click: function() { $(this).dialog("close"); }}
+                    {text: _t("Ok"), click: function() { this.parents('.modal').modal('hide'); }}
                 ]
-            });
+            }, QWeb.render("CrashManager.warning", result.warning)).open();
         }
 
         return $.Deferred().resolve();
@@ -1080,7 +1080,6 @@ instance.web.FormView = instance.web.View.extend(instance.web.form.FieldManagerM
                 };
             })
             .value();
-
         var d = new instance.web.Dialog(this, {
             title: _t("Set Default"),
             args: {
@@ -1956,26 +1955,23 @@ instance.web.form.WidgetButton = instance.web.form.FormWidget.extend({
         var exec_action = function() {
             if (self.node.attrs.confirm) {
                 var def = $.Deferred();
-                var dialog = instance.web.dialog($('<div/>').text(self.node.attrs.confirm), {
+                var dialog = instance.web.Dialog(this, {
                     title: _t('Confirm'),
-                    modal: true,
                     buttons: [
                         {text: _t("Cancel"), click: function() {
-                                $(this).dialog("close");
+                                this.parents('.modal').modal('hide');
                             }
                         },
                         {text: _t("Ok"), click: function() {
                                 var self2 = this;
                                 self.on_confirmed().always(function() {
-                                    $(self2).dialog("close");
+                                    self2.parents('.modal').modal('hide');
                                 });
                             }
                         }
                     ],
-                    beforeClose: function() {
-                        def.resolve();
-                    },
-                });
+                }, $('<div/>').text(self.node.attrs.confirm)).open();
+                dialog.on("closing", null, function() {def.resolve();});
                 return def.promise();
             } else {
                 return self.on_confirmed();
@@ -3234,7 +3230,7 @@ instance.web.form.M2ODialog = instance.web.Dialog.extend({
     init: function(parent) {
         this._super(parent, {
             title: _.str.sprintf(_t("Add %s"), parent.string),
-            width: 312,
+            size: 'medium',
         });
     },
     start: function() {
@@ -3302,7 +3298,7 @@ instance.web.form.FieldMany2One = instance.web.form.AbstractField.extend(instanc
             delete this.$drop_down;
         }
         if (this.$input) {
-            this.$input.closest(".ui-dialog .ui-dialog-content").off('scroll');
+            this.$input.closest(".modal .modal-content").off('scroll');
             this.$input.off('keyup blur autocompleteclose autocompleteopen ' +
                             'focus focusout change keydown');
             delete this.$input;
@@ -3395,7 +3391,7 @@ instance.web.form.FieldMany2One = instance.web.form.AbstractField.extend(instanc
                 self.$input.autocomplete("close");
             }
         }, 50);
-        this.$input.closest(".ui-dialog .ui-dialog-content").on('scroll', this, close_autocomplete);
+        this.$input.closest(".modal .modal-content").on('scroll', this, close_autocomplete);
 
         self.ed_def = $.Deferred();
         self.uned_def = $.Deferred();
@@ -4921,13 +4917,12 @@ instance.web.form.AbstractFormPopup = instance.web.Widget.extend({
         var self = this;
         this.renderElement();
         var dialog = new instance.web.Dialog(this, {
-            min_width: '800px',
             dialogClass: 'oe_act_window',
-            close: function() {
-                self.check_exit(true);
-            },
             title: this.options.title || "",
         }, this.$el).open();
+        dialog.on('closing', this, function (e){
+            self.check_exit(true);
+        });
         this.$buttonpane = dialog.$buttons;
         this.start();
     },
@@ -4994,8 +4989,8 @@ instance.web.form.AbstractFormPopup = instance.web.Widget.extend({
     },
     destroy: function () {
         this.trigger('closed');
-        if (this.$el.is(":data(dialog)")) {
-            this.$el.dialog('close');
+        if (this.$el.is(":data(bs.modal)")) {
+            this.$el.parents('.modal').modal('hide');
         }
         this._super();
     },
diff --git a/addons/web/static/src/js/views.js b/addons/web/static/src/js/views.js
index 2f401445f7e..dc9f706d40e 100644
--- a/addons/web/static/src/js/views.js
+++ b/addons/web/static/src/js/views.js
@@ -410,10 +410,10 @@ instance.web.ActionManager = instance.web.Widget.extend({
             }
             this.dialog_stop(executor.action);
             this.dialog = new instance.web.Dialog(this, {
+                title: executor.action.name,
                 dialogClass: executor.klass,
             });
             this.dialog.on("closing", null, options.on_close);
-            this.dialog.dialog_title = executor.action.name;
             if (widget instanceof instance.web.ViewManager) {
                 _.extend(widget.flags, {
                     $buttons: this.dialog.$buttons,
@@ -926,7 +926,7 @@ instance.web.ViewManagerAction = instance.web.ViewManager.extend({
             current_view = this.views[this.active_view].controller;
         switch (val) {
             case 'fvg':
-                var dialog = new instance.web.Dialog(this, { title: _t("Fields View Get"), width: '95%' }).open();
+                var dialog = new instance.web.Dialog(this, { title: _t("Fields View Get") }).open();
                 $('<pre>').text(instance.web.json_node_to_xml(current_view.fields_view.arch, true)).appendTo(dialog.$el);
                 break;
             case 'tests':
@@ -943,7 +943,7 @@ instance.web.ViewManagerAction = instance.web.ViewManager.extend({
                     this.dataset.call('perm_read', [ids]).done(function(result) {
                         var dialog = new instance.web.Dialog(this, {
                             title: _.str.sprintf(_t("View Log (%s)"), self.dataset.model),
-                            width: 400
+                            size: 'medium',
                         }, QWeb.render('ViewManagerDebugViewLog', {
                             perm : result[0],
                             format : instance.web.format_value
@@ -986,7 +986,7 @@ instance.web.ViewManagerAction = instance.web.ViewManager.extend({
                     new instance.web.Dialog(self, {
                         title: _.str.sprintf(_t("Model %s fields"),
                                              self.dataset.model),
-                        width: '95%'}, $root).open();
+                        }, $root).open();
                 });
                 break;
             case 'edit_workflow':
@@ -1223,7 +1223,7 @@ instance.web.Sidebar = instance.web.Widget.extend({
                 domain = $.Deferred().resolve(undefined);
             }
             if (ids.length === 0) {
-                instance.web.dialog($("<div />").text(_t("You must choose at least one record.")), { title: _t("Warning"), modal: true });
+                new instance.web.Dialog(this, { title: _t("Warning"), size: 'medium',}, $("<div />").text(_t("You must choose at least one record."))).open();
                 return false;
             }
             var active_ids_context = {
diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index 12827157c24..b03fc8fc168 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -32,7 +32,20 @@
         <t t-esc="message"/>
     </div>
 </t>
-
+<t t-name="Dialog">
+    <div class="modal" tabindex="-1" data-backdrop="static" role="dialog" aria-hidden="true">
+        <div class="modal-dialog modal-lg">
+            <div class="modal-content">
+                <div class="modal-header">
+                    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
+                    <h3 class="modal-title"><t t-raw="title"/></h3>
+                </div>
+                <div class="modal-body">
+                </div>
+            </div>
+        </div>
+    </div>
+</t>
 <t t-name="CrashManager.warning">
     <table cellspacing="0" cellpadding="0" border="0" class="oe_dialog_warning">
     <tr>
diff --git a/addons/web_diagram/static/src/js/diagram.js b/addons/web_diagram/static/src/js/diagram.js
index 2d3e3cc6b45..77876c9dc52 100644
--- a/addons/web_diagram/static/src/js/diagram.js
+++ b/addons/web_diagram/static/src/js/diagram.js
@@ -101,7 +101,6 @@ instance.web.DiagramView = instance.web.View.extend({
             params['connectors_fields'].push(self.fields[conn.attrs.name]['string']|| this.toTitleCase(conn.attrs.name));
             params['connectors'].push(conn.attrs.name);
         });
-
         this.rpc(
             '/web_diagram/diagram/get_diagram_info',params).done(function(result) {
                 self.draw_diagram(result);
@@ -179,11 +178,6 @@ instance.web.DiagramView = instance.web.View.extend({
         var r  = new Raphael(canvas, '100%','100%');
 
         var graph  = new CuteGraph(r,style,canvas.parentNode);
-        
-        var confirm_dialog = $('#dialog').dialog({ 
-            autoOpen: false,
-            title: _t("Are you sure?") });
-        
 
         _.each(res_nodes, function(node) {
             var n = new CuteNode(
@@ -344,7 +338,7 @@ instance.web.DiagramView = instance.web.View.extend({
         });
         // We want to destroy the dummy edge after a creation cancel. This destroys it even if we save the changes.
         // This is not a problem since the diagram is completely redrawn on saved changes.
-        pop.$el.bind("dialogbeforeclose",function(){
+        pop.$el.parents('.modal').on('hidden.bs.modal', function (e){
             if(dummy_cuteedge){
                 dummy_cuteedge.remove();
             }
diff --git a/addons/web_view_editor/static/src/js/view_editor.js b/addons/web_view_editor/static/src/js/view_editor.js
index 69e9a3080b7..ad5e991ae66 100644
--- a/addons/web_view_editor/static/src/js/view_editor.js
+++ b/addons/web_view_editor/static/src/js/view_editor.js
@@ -58,7 +58,6 @@ instance.web_view_editor.ViewEditor =   instance.web.Widget.extend({
         };
         this.view_edit_dialog = new instance.web.Dialog(this, {
             title: action_title,
-            width: 850,
             buttons: [
                 {text: _t("Create"), click: function() { self.on_create_view(); }},
                 {text: _t("Edit"), click: function() { self.xml_element_id = 0; self.get_arch(); }},
@@ -376,7 +375,6 @@ instance.web_view_editor.ViewEditor =   instance.web.Widget.extend({
         this.one_object = one_object;
         this.edit_xml_dialog = new instance.web.Dialog(this, {
             title: _.str.sprintf(_t("View Editor %d - %s"), self.main_view_id, self.model),
-            height: '90%',
             buttons: [
                 {text: _t("Inherited View"), click: function(){
                     var selected_row = self.edit_xml_dialog.$el.find('.ui-selected');
@@ -829,7 +827,7 @@ instance.web_view_editor.ViewEditor =   instance.web.Widget.extend({
         var self = this;
         this.edit_node_dialog = new instance.web.Dialog(this,{
             title: _t("Properties"),
-            width: 450,
+            size: 'medium',
             buttons: [
                 {text: _t("Update"), click: function () {
                     var warn = false, update_values = [];
@@ -955,7 +953,7 @@ instance.web_view_editor.ViewEditor =   instance.web.Widget.extend({
         this.add_widget = [];
         this.add_node_dialog = new instance.web.Dialog(this,{
             title: _t("Properties"),
-            width: 450,
+            size: 'medium',
             buttons: [
                 {text: _t("Update"), click: function() {
                     var check_add_node = true, values = {};