diff --git a/js/curve-fitting/CurveFittingConstants.js b/js/curve-fitting/CurveFittingConstants.js
index c6cd188..a97961e 100644
--- a/js/curve-fitting/CurveFittingConstants.js
+++ b/js/curve-fitting/CurveFittingConstants.js
@@ -10,6 +10,8 @@ define( function() {
   'use strict';
 
   return {
+    MAX_ORDER_OF_FIT: 3,
+
     // barometer
     BAROMETER_HEIGHT: 270,
     BAROMETER_TICK_WIDTH: 15,
diff --git a/js/curve-fitting/model/Curve.js b/js/curve-fitting/model/Curve.js
index 3ac9d59..fa0543f 100644
--- a/js/curve-fitting/model/Curve.js
+++ b/js/curve-fitting/model/Curve.js
@@ -24,10 +24,9 @@ define( function( require ) {
   /**
    * @param {Property.<number>} orderOfFitProperty - Property to control curve type.
    * @param {Property.<string>} fitTypeProperty - Property to control fit type.
-   * @param {number} maxFitOrder - Max order of fit.
    * @constructor
    */
-  function Curve( orderOfFitProperty, fitTypeProperty, maxFitOrder ) {
+  function Curve( orderOfFitProperty, fitTypeProperty ) {
     var self = this;
 
     PropertySet.call( this, {
@@ -53,7 +52,7 @@ define( function( require ) {
     this.points = new ObservableArray();
 
     // special object to getting fit for points
-    this.fitMaker = new FitMaker( maxFitOrder );
+    this.fitMaker = new FitMaker();
 
     this._updateFitBound = this.updateFit.bind( this );
 
diff --git a/js/curve-fitting/model/CurveFittingModel.js b/js/curve-fitting/model/CurveFittingModel.js
index 43fa25b..bc361ea 100644
--- a/js/curve-fitting/model/CurveFittingModel.js
+++ b/js/curve-fitting/model/CurveFittingModel.js
@@ -32,9 +32,6 @@ define( function( require ) {
       isEquationPanelExpanded: true // property to control equation panel expansion
     } );
 
-    // max order of fit
-    this.maxOrderOfFit = 3;
-
     // bucket model
     var BUCKET_WIDTH = 90;
     var BUCKET_HEIGHT = BUCKET_WIDTH * 0.50;
@@ -46,7 +43,7 @@ define( function( require ) {
     } );
 
     // curve model
-    this.curve = new Curve( this.orderOfFitProperty, this.fitTypeProperty, this.maxOrderOfFit );
+    this.curve = new Curve( this.orderOfFitProperty, this.fitTypeProperty );
 
     // graph area size
     this.graphArea = {
diff --git a/js/curve-fitting/model/FitMaker.js b/js/curve-fitting/model/FitMaker.js
index ddc510f..4837d73 100644
--- a/js/curve-fitting/model/FitMaker.js
+++ b/js/curve-fitting/model/FitMaker.js
@@ -5,16 +5,18 @@
  *
  * @author Andrey Zelenkov (Mlearner)
  */
-define( function() {
+define( function( require ) {
   'use strict';
 
+  // modules
+  var CurveFittingConstants = require( 'CURVE_FITTING/curve-fitting/CurveFittingConstants' );
+
   /**
-   * @param {number} maxOrderOfFit - Max order of fit.
    * @constructor
    */
-  function FitMaker( maxOrderOfFit ) {
+  function FitMaker() {
     // set max size of matrix
-    this.maxM = maxOrderOfFit + 1;
+    this.maxM = CurveFittingConstants.MAX_ORDER_OF_FIT + 1;
     this.m = null;
 
     // create solution array
diff --git a/js/curve-fitting/view/ControlMenuNode.js b/js/curve-fitting/view/ControlMenuNode.js
index 104e536..df668a0 100644
--- a/js/curve-fitting/view/ControlMenuNode.js
+++ b/js/curve-fitting/view/ControlMenuNode.js
@@ -83,7 +83,7 @@ define( function( require ) {
     this.addChild( curveTypePanel );
 
     // create fit type menu
-    var fitTypeMenu = new FitTypeMenu( curveFittingModel.curve, curveFittingModel.fitTypeProperty, curveFittingModel.orderOfFitProperty, curveFittingModel.maxOrderOfFit );
+    var fitTypeMenu = new FitTypeMenu( curveFittingModel.curve, curveFittingModel.fitTypeProperty, curveFittingModel.orderOfFitProperty, curveFittingModel );
     this.addChild( fitTypeMenu );
 
     // add observers
diff --git a/js/curve-fitting/view/EquationFitNode.js b/js/curve-fitting/view/EquationFitNode.js
index 8213ca5..16cbe9a 100644
--- a/js/curve-fitting/view/EquationFitNode.js
+++ b/js/curve-fitting/view/EquationFitNode.js
@@ -30,16 +30,15 @@ define( function( require ) {
 
   /**
    * @param {Property.<number>} orderFitProperty parameter to track.
-   * @param {number} maxOrderFit - Possible range for property.
    * @param {Object} [options] for slider node.
    * @constructor
    */
-  function EquationFitNode( orderFitProperty, maxOrderFit, options ) {
+  function EquationFitNode( orderFitProperty, options ) {
     var self = this;
     var equationTextArray = [];
     var boxNode;
 
-    for ( var i = 1; i < maxOrderFit + 1; i++ ) {
+    for ( var i = 1; i < CurveFittingConstants.MAX_ORDER_OF_FIT + 1; i++ ) {
       boxNode = new HBox( { align: 'bottom' } );
       var yNode = new Text( 'y = ', TEXT_OPTIONS );
       boxNode.addChild( yNode );
diff --git a/js/curve-fitting/view/FitTypeMenu.js b/js/curve-fitting/view/FitTypeMenu.js
index 988622a..2776fc8 100644
--- a/js/curve-fitting/view/FitTypeMenu.js
+++ b/js/curve-fitting/view/FitTypeMenu.js
@@ -37,11 +37,10 @@ define( function( require ) {
    * @param {Curve} curve model.
    * @param {Property.<string>} fitTypeProperty - Property to control fit type of curve.
    * @param {Property.<number>} orderOfFitProperty - Property to control type of curve.
-   * @param {number} maxOrderOfFit - Max order of fit.
    * @param {Object} [options] for graph node.
    * @constructor
    */
-  function FitTypeMenu( curve, fitTypeProperty, orderOfFitProperty, maxOrderOfFit, options ) {
+  function FitTypeMenu( curve, fitTypeProperty, orderOfFitProperty, options ) {
     var content = new VBox();
 
     // create radio buttons
@@ -53,7 +52,7 @@ define( function( require ) {
     content.addChild( fitTypeRadioButtonGroup );
 
     // create equation node
-    content.addChild( new EquationFitNode( orderOfFitProperty, maxOrderOfFit ) );
+    content.addChild( new EquationFitNode( orderOfFitProperty ) );
 
     // create slider for parameters
     var aSliderBox = new SliderParameterNode( curve.aProperty, { min: -1, max: 1 }, 'a' );