diff --git a/CardGameApp/CardGameApp/DelegateModel/DeckManager.swift b/CardGameApp/CardGameApp/DelegateModel/DeckManager.swift
index 87143ee8..2838b4fd 100644
--- a/CardGameApp/CardGameApp/DelegateModel/DeckManager.swift
+++ b/CardGameApp/CardGameApp/DelegateModel/DeckManager.swift
@@ -9,8 +9,8 @@
 import Foundation
 
 class DeckManager: CardDeckDelegate {
-    var deck: CardDeck!
-    var openedDeck = [Card]()
+    private var deck: CardDeck!
+    private var openedDeck = [Card]()
 
     init(deck: CardDeck) {
         self.deck = deck
diff --git a/CardGameApp/CardGameApp/DelegateModel/FoundationDelegate.swift b/CardGameApp/CardGameApp/DelegateModel/FoundationDelegate.swift
index 5adef998..07adb0b8 100644
--- a/CardGameApp/CardGameApp/DelegateModel/FoundationDelegate.swift
+++ b/CardGameApp/CardGameApp/DelegateModel/FoundationDelegate.swift
@@ -9,9 +9,8 @@
 import Foundation
 
 class FoundationManager: FoundationDelegate, Stackable {
-
     static let range: CountableRange = 0..<4
-    var foundations = [CardStack]()
+    private var foundations = [CardStack]()
     var lastCards: [Card?] {
         return foundations.map{ $0.last() }
     }
diff --git a/CardGameApp/CardGameApp/DelegateModel/StackManager.swift b/CardGameApp/CardGameApp/DelegateModel/StackManager.swift
index 63d5ca37..1d524e26 100644
--- a/CardGameApp/CardGameApp/DelegateModel/StackManager.swift
+++ b/CardGameApp/CardGameApp/DelegateModel/StackManager.swift
@@ -9,14 +9,12 @@
 import Foundation
 
 class StackManager: StackDelegate {
-
     private static var stackDelegates = [StackManager]()
-
+    private var column: Int!
+    private var stack: CardStack!
     private var lastCard: Card? {
         return self.stack.last()
     }
-    private var column: Int!
-    private var stack: CardStack!
 
     init(oneStack: CardStack, column: Int) {
         self.stack = oneStack
diff --git a/CardGameApp/CardGameApp/DelegateModel/WholeStackManager.swift b/CardGameApp/CardGameApp/DelegateModel/WholeStackManager.swift
index be84fd7f..9b584296 100644
--- a/CardGameApp/CardGameApp/DelegateModel/WholeStackManager.swift
+++ b/CardGameApp/CardGameApp/DelegateModel/WholeStackManager.swift
@@ -9,7 +9,7 @@
 import Foundation
 
 class WholeStackManager: CardStackDelegate,Stackable {
-    var stackManagers: [StackDelegate]!
+    private var stackManagers: [StackDelegate]!
 
     init(stacks: [CardStack]) {
         var stackManagers = [StackDelegate]()
diff --git a/CardGameApp/CardGameApp/Model/Card.swift b/CardGameApp/CardGameApp/Model/Card.swift
index 0f24f4bf..ba9bc2b2 100644
--- a/CardGameApp/CardGameApp/Model/Card.swift
+++ b/CardGameApp/CardGameApp/Model/Card.swift
@@ -34,7 +34,7 @@ class Card: CustomStringConvertible, Comparable, Hashable, ImageSelector {
         }
     }
 
-    var backImage = "card-back"
+    let backImage = "card-back"
 
     var frontImage: String {
         var shape = ""
diff --git a/CardGameApp/CardGameApp/View/CardDeckView.swift b/CardGameApp/CardGameApp/View/CardDeckView.swift
index 1ad94018..c8a1bc49 100644
--- a/CardGameApp/CardGameApp/View/CardDeckView.swift
+++ b/CardGameApp/CardGameApp/View/CardDeckView.swift
@@ -9,9 +9,9 @@
 import UIKit
 
 class CardDeckView: UIView {
-    var gameManager: CardGameDelegate = CardGameManager.shared()
-    var closedCardDeck = CardImageView()
-    var deckManager: CardDeckDelegate!
+    private var gameManager: CardGameDelegate = CardGameManager.shared()
+    private var closedCardDeck = CardImageView()
+    private var deckManager: CardDeckDelegate!
     var lastCardView: CardImageView? {
         guard let lastView = subviews.last else { return nil }
         return lastView as? CardImageView
diff --git a/CardGameApp/CardGameApp/View/CardImageView.swift b/CardGameApp/CardGameApp/View/CardImageView.swift
index 0fe404ea..d76b352e 100644
--- a/CardGameApp/CardGameApp/View/CardImageView.swift
+++ b/CardGameApp/CardGameApp/View/CardImageView.swift
@@ -10,8 +10,8 @@ import UIKit
 
 class CardImageView: UIImageView {
 
-    var imageName: String!
-    var card: ImageSelector?
+    private var imageName: String!
+    private var card: ImageSelector?
 
     override func awakeFromNib() {
         super.awakeFromNib()
diff --git a/CardGameApp/CardGameApp/View/CardStacksView.swift b/CardGameApp/CardGameApp/View/CardStacksView.swift
index d8f771a0..3b2bb273 100644
--- a/CardGameApp/CardGameApp/View/CardStacksView.swift
+++ b/CardGameApp/CardGameApp/View/CardStacksView.swift
@@ -9,9 +9,8 @@
 import UIKit
 
 class CardStacksView: UIView {
-    var gameManager: CardGameDelegate = CardGameManager.shared()
-    var wholeStackManager: (CardStackDelegate & Stackable)!
-    var oneStackViews = [OneStack]()
+    private var wholeStackManager: (CardStackDelegate & Stackable)!
+    private var oneStackViews = [OneStack]()
 
     override init(frame: CGRect) {
         super.init(frame: frame)
@@ -21,7 +20,7 @@ class CardStacksView: UIView {
     convenience init() {
         self.init(frame: CGRect(x: 0, y: PositionY.bottom.value,
                                 width: 414, height: 736 - PositionY.bottom.value))
-        self.wholeStackManager = gameManager.getWholeStackDelegate()
+        self.wholeStackManager = CardGameManager.shared().getWholeStackDelegate()
     }
 
     required init?(coder aDecoder: NSCoder) {
@@ -47,9 +46,9 @@ class CardStacksView: UIView {
 }
 
 class OneStack: UIView {
-    var column: Int!
-    var wholeStackManager: (CardStackDelegate & Stackable)!
-    var stackManager: StackDelegate!
+    private var column: Int!
+    private var wholeStackManager: (CardStackDelegate & Stackable)!
+    private var stackManager: StackDelegate!
     var lastCardView: CardImageView? {
         guard let lastView = subviews.last else { return nil }
         return lastView as? CardImageView
@@ -105,5 +104,9 @@ class OneStack: UIView {
         }
     }
 
+    func getColumn() -> Int {
+        return self.column
+    }
+
 }
 
diff --git a/CardGameApp/CardGameApp/View/FoundationView.swift b/CardGameApp/CardGameApp/View/FoundationView.swift
index 3d8ca963..b6e7f090 100644
--- a/CardGameApp/CardGameApp/View/FoundationView.swift
+++ b/CardGameApp/CardGameApp/View/FoundationView.swift
@@ -9,9 +9,9 @@
 import UIKit
 
 class FoundationView: UIView {
-    let gameManager: CardGameDelegate = CardGameManager.shared()
-    var foundationManager: FoundationDelegate!
-    let numberOfFoundation = 4
+    private let gameManager: CardGameDelegate = CardGameManager.shared()
+    private var foundationManager: FoundationDelegate!
+    private let numberOfFoundation = 4
 
     override init(frame: CGRect) {
         super.init(frame: frame)
diff --git a/CardGameApp/CardGameApp/ViewController.swift b/CardGameApp/CardGameApp/ViewController.swift
index 8be0d3a8..93960444 100644
--- a/CardGameApp/CardGameApp/ViewController.swift
+++ b/CardGameApp/CardGameApp/ViewController.swift
@@ -150,7 +150,7 @@ class ViewController: UIViewController {
         guard let userInfo = notification.userInfo else { return }
         guard let from = userInfo["from"] else { return }
         guard let fromView = from as? OneStack else { return }
-        let fromIndex = fromView.column!
+        let fromIndex = fromView.getColumn()
         let targetCard = fromView.lastCardView!
 
         let result = cardGameManager.movableFromStack(from: .fromStack, column: fromIndex)