diff --git a/js/mergesort.js b/js/mergesort.js
index 0178faa..952b140 100644
--- a/js/mergesort.js
+++ b/js/mergesort.js
@@ -2,8 +2,86 @@
  *
  */
 var MergeSort = function(VisualizerInstance) {
+    //===== Inits.
     this.V = VisualizerInstance;
     this.comparisons = 0;
+
+    //===== Action management.
+    //
+    this.initSort = function(arr, start, end) {
+        this.V
+            .instruct(this.V.unhighlight, 0)
+            .instruct(this.V.unfade, 0)
+            .instruct(this.V.fade, 0, -1, start - 1)
+            .instruct(this.V.fade, 0, end + 1, arr.length)
+            .instruct(this.V.message, 0, 1, `Comparisons: ${this.comparisons}`)
+            .instruct(this.V.message, 0, 2, '')
+            .instruct(this.V.message, 0, 3, '')
+            .instruct(this.V.message, 0, 4, '')
+            .instruct(this.V.message, 0, 5, '');
+    };
+
+    //
+    this.splitSingle = function(index) {
+        this.V.instruct(this.V.message, 100, 2, `Single element [${index}]`);
+    };
+
+    //
+    this.preSort = function(start, mid, end) {
+        this.V
+            .instruct(this.V.message, 0, 2, `Sorting [${start}] - [${end}]`)
+            .instruct(this.V.message, 0, 3, 'Slicing and recursing:')
+            .instruct(this.V.message, 100, 4, `[${start}]-[${mid}] and [${mid + 1}]-[${end}]`);
+    };
+
+    //
+    this.preMerge = function(arr1, arr2, start, mid, end) {
+        var i, j, x, y, v;
+        var len1 = arr1.length;
+        var len2 = arr2.length;
+
+        for (var i = 0; i < len1; i++) {
+            x = Visualizer.padding + (i + start) * (Visualizer.itemW + Visualizer.spacerW);
+            y = Visualizer.padding * 2 + Visualizer.itemH;
+            v = arr1[i].value;
+            this.V.instruct(this.V.item, 0, 'secondary', x, y, v, '#05350D')
+        }
+
+        for (var j = 0; j < len2; j++) {
+            x = Visualizer.padding + (j + len1 + start) * (Visualizer.itemW + Visualizer.spacerW);
+            y = Visualizer.padding * 2 + Visualizer.itemH;
+            v = arr2[j].value;
+            this.V.instruct(this.V.item, 0, 'secondary', x, y, v, '#028E2D')
+        }
+
+        this.V
+            // .instruct(this.V.fade, 0, 0, arr.length)
+            .instruct(this.V.message, 0, 2, ``)
+            .instruct(this.V.message, 0, 3, 'Merging slices:')
+            .instruct(this.V.message, 0, 4, `[${start}]-[${mid}] and [${mid + 1}]-[${end}]`)
+            .instruct(this.V.removeTertiary, 0);
+    };
+
+    //
+    this.postMerge = function() {
+        this.V.instruct(this.V.removeSecondary, 0);
+    };
+
+    //
+    this.midMerge = function(index, value, message) {
+        var x = Visualizer.padding + index * (Visualizer.itemW + Visualizer.spacerW);
+        var y = Visualizer.padding * 3 + Visualizer.itemH * 2
+
+        this.V
+            .instruct(this.V.item, 0, 'tertiary', x, y, value, '#8E5500')
+            .instruct(this.V.message, 0, 4, message)
+            .instruct(this.V.message, 100, 5, `Pushing ${value} to sub-result.`);
+    };
+
+    //
+    this.updateComparisons = function() {
+        this.V.instruct(this.V.message, 0, 1, `Comparisons: ${this.comparisons}`);
+    };
 };
 
 MergeSort.prototype = Object.create(Sorter.prototype);
@@ -12,64 +90,28 @@ MergeSort.prototype = Object.create(Sorter.prototype);
  *
  */
 MergeSort.prototype.sort = function(arr, start, end) {
-    this.V
-        .instruct(this.V.unhighlight, 0)
-        .instruct(this.V.unfade, 0)
-        .instruct(this.V.fade, 0, -1, start - 1)
-        .instruct(this.V.fade, 0, end + 1, arr.length)
-        .instruct(this.V.message, 0, 1, `Comparisons: ${this.comparisons}`)
-        .instruct(this.V.message, 0, 2, '')
-        .instruct(this.V.message, 0, 3, '')
-        .instruct(this.V.message, 0, 4, '')
-        .instruct(this.V.message, 0, 5, '');
+    this.initSort(arr, start, end);
 
     if (arr.length === 0) {
         return arr;
     }
 
     if (start === end) {
-        this.V
-            .instruct(this.V.message, 100, 2, `Single element [${start}]`)
+        this.splitSingle(start);
         return new Array(arr[start]);
     }
 
 
     var mid = start + Math.floor((end - start) / 2);
 
-    this.V
-        .instruct(this.V.message, 0, 2, `Sorting [${start}] - [${end}]`)
-        .instruct(this.V.message, 0, 3, 'Slicing and recursing:')
-        .instruct(this.V.message, 100, 4, `[${start}]-[${mid}] and [${mid + 1}]-[${end}]`);
-
+    this.preSort(start, mid, end);
     var arr1 = this.sort(arr, start, mid);
     var arr2 = this.sort(arr, mid + 1, end);
 
-    var i, j, x, y, v;
-    var len1 = arr1.length;
-    var len2 = arr2.length;
-
-    for (var i = 0; i < len1; i++) {
-        x = Visualizer.padding + (i + start) * (Visualizer.itemW + Visualizer.spacerW);
-        y = Visualizer.padding * 2 + Visualizer.itemH;
-        v = arr1[i].value;
-        this.V.instruct(this.V.item, 0, 'secondary', x, y, v, '#05350D')
-    }
-
-    for (var j = 0; j < len2; j++) {
-        x = Visualizer.padding + (j + len1 + start) * (Visualizer.itemW + Visualizer.spacerW);
-        y = Visualizer.padding * 2 + Visualizer.itemH;
-        v = arr2[j].value;
-        this.V.instruct(this.V.item, 0, 'secondary', x, y, v, '#028E2D')
-    }
-
-    this.V
-        .instruct(this.V.fade, 0, 0, arr.length)
-        .instruct(this.V.message, 0, 2, ``)
-        .instruct(this.V.message, 0, 3, 'Merging slices:')
-        .instruct(this.V.message, 0, 4, `[${start}]-[${mid}] and [${mid + 1}]-[${end}]`)
-
+    this.preMerge(arr1, arr2, start, mid, end);
     var result = this.merge(arr1, arr2);
-    this.V.instruct(this.V.removeSecondary, 0);
+
+    this.postMerge();
     return result;
 };
 
@@ -78,53 +120,32 @@ MergeSort.prototype.sort = function(arr, start, end) {
  */
 MergeSort.prototype.merge = function(arr1, arr2) {
     var result = [];
-    var e, x, y, v;
-
-    this.V.instruct(this.V.removeTertiary, 100);
+    var e;
 
     while (arr1.length > 0 || arr2.length > 0) {
-        x = Visualizer.padding + result.length * (Visualizer.itemW + Visualizer.spacerW);
-        y = Visualizer.padding * 3 + Visualizer.itemH * 2
-
         if (arr1.length === 0) {
             e = arr2.shift();
             result.push(e);
-
-            this.V
-                .instruct(this.V.item, 0, 'tertiary', x, y, e.value, '#8E5500')
-                .instruct(this.V.message, 0, 4, 'One element left to merge.')
-                .instruct(this.V.message, 100, 5, `Pushing ${e.value} to sub-result.`);
+            this.midMerge(result.length, e.value, 'One element left to merge.');
         }
         else if (arr2.length === 0) {
             e = arr1.shift();
             result.push(e);
-
-            this.V
-                .instruct(this.V.item, 0, 'tertiary', x, y, e.value, '#8E5500')
-                .instruct(this.V.message, 0, 4, 'One element left to merge.')
-                .instruct(this.V.message, 100, 5, `Pushing ${e.value} to sub-result.`);
+            this.midMerge(result.length, e.value, 'One element left to merge.');
         }
         else if (arr1[0].value <= arr2[0].value) {
             e = arr1.shift()
             result.push(e);
-
-            this.V
-                .instruct(this.V.item, 0, 'tertiary', x, y, e.value, '#8E5500')
-                .instruct(this.V.message, 0, 4, `${e.value} <= ${arr2[0].value}`)
-                .instruct(this.V.message, 100, 5, `Pushing ${e.value} to sub-result.`);
+            this.midMerge(result.length, e.value, `${e.value} <= ${arr2[0].value}`);
         }
         else {
             e = arr2.shift();
             result.push(e);
-
-            this.V
-                .instruct(this.V.item, 0, 'tertiary', x, y, e.value, '#8E5500')
-                .instruct(this.V.message, 0, 4, `${arr1[0].value} > ${e.value}`)
-                .instruct(this.V.message, 100, 5, `Pushing ${e.value} to sub-result.`);
+            this.midMerge(result.length, e.value, `${arr1[0].value} > ${e.value}`);
         }
 
         this.comparisons++;
-        this.V.instruct(this.V.message, 0, 1, `Comparisons: ${this.comparisons}`);
+        this.updateComparisons();
     }
 
     return result;
diff --git a/js/visualizer-inits.js b/js/visualizer-inits.js
index cc37d39..d7dce74 100644
--- a/js/visualizer-inits.js
+++ b/js/visualizer-inits.js
@@ -19,7 +19,7 @@ Visualizer.prototype.initItems = function(n) {
         this.svg.remove();
     }
 
-    this.instructionIndex = 0;
+    this.actionIndex = 0;
     this.svg = d3.select(this.parent).append('svg')
         .attr('class', 'sorter-svg');
 
@@ -140,20 +140,20 @@ Visualizer.prototype.initControls = function() {
         this.paused = !this.paused;
         updatePlayPause(this.paused);
 
-        if (this.instructionIndex === this.instructions.length) {
+        if (this.actionIndex === this.actions.length) {
             this.reset();
             this.paused = false;
-            this.followInstruction();
+            this.go();
         }
         else {
-            this.followInstruction();
+            this.go();
         }
     };
 
     var forwardclick = function() {
         this.paused = true;
-        this.followInstruction();
-        this.instructionIndex++;
+        this.go();
+        this.actionIndex++;
     };
 
     var restartclick = function() {
diff --git a/js/visualizer.js b/js/visualizer.js
index ed31f76..420aa7f 100644
--- a/js/visualizer.js
+++ b/js/visualizer.js
@@ -2,7 +2,7 @@
  *
  */
 function Visualizer(parent) {
-    this.instructions = [];
+    this.actions = [];
     this.parent = parent;
     this.sorter = null;
     this.paused = true;
@@ -76,19 +76,19 @@ Visualizer.calculateX = function(index) {
  *
  */
 Visualizer.prototype.instruct = function() {
-    this.instructions.push(arguments);
+    this.actions.push(arguments);
     return this;
 };
 
 /**
  * Instructions contain a string with the name of a function in this object which is called to perform an action.
  */
-Visualizer.prototype.followInstruction = function() {
-    if (this.instructionIndex >= this.instructions.length) {
+Visualizer.prototype.go = function() {
+    if (this.actionIndex >= this.actions.length) {
         return;
     }
 
-    var obj = this.instructions[this.instructionIndex];
+    var obj = this.actions[this.actionIndex];
     var instruction = new Array();
 
     for (var key in obj) {
@@ -115,12 +115,12 @@ Visualizer.prototype.followInstruction = function() {
     instruction[0].apply(this, args);
 
     if (delay === 0) {
-        this.instructionIndex++;
-        this.followInstruction();
+        this.actionIndex++;
+        this.go();
     }
     else if (this.paused === false) {
-        this.instructionIndex++;
-        setTimeout(this.followInstruction.bind(this), delay);
+        this.actionIndex++;
+        setTimeout(this.go.bind(this), delay);
     }
 };
 
@@ -128,7 +128,7 @@ Visualizer.prototype.followInstruction = function() {
  *
  */
 Visualizer.prototype.reset = function() {
-    this.instructionIndex = 0;
+    this.actionIndex = 0;
 
     this.message(0, 1, '');
     this.message(0, 2, '');