diff --git a/lib/service/configuration_service.dart b/lib/service/configuration_service.dart
index e11a5e8..045e66c 100644
--- a/lib/service/configuration_service.dart
+++ b/lib/service/configuration_service.dart
@@ -2,15 +2,17 @@ import 'dart:html' as html;
 import 'dart:math';
 
 import 'package:rules_of_living/service/engine_service.dart';
+import 'package:rules_of_living/service/simulation_service.dart';
 
 class ConfigurationService {
-  final EngineService _es;
+  final EngineService _engine;
+  final SimulationService _sim;
 
   bool showGrid;
 
   int _simSpeed;
 
-  ConfigurationService(this._es) {
+  ConfigurationService(this._engine, this._sim) {
     showGrid = false;
     simSpeed = 5;
   }
@@ -23,21 +25,20 @@ class ConfigurationService {
   int get simSpeed => _simSpeed;
   void set simSpeed(int val) {
     _simSpeed = val;
-    _es.engine.stepsPerSecond = simSpeed;
+    //TODO make method in EngineService to respect Demeter
+    _engine.engine.stepsPerSecond = simSpeed;
   }
 
-  void set canvas(html.CanvasElement canvas) => _es.engine.canvas = canvas;
-  html.CanvasElement get canvas => _es.engine.canvas;
+  void set canvas(html.CanvasElement canvas) => _engine.engine.canvas = canvas;
+  html.CanvasElement get canvas => _engine.engine.canvas;
 
   void toggleGrid() {
     showGrid = !showGrid;
   }
 
   void setGridSize({int x, int y}) {
-    x = x ?? _es.engine.gridSize.x;
-    y = y ?? _es.engine.gridSize.y;
-    _es.engine.gridSize = Point(x, y);
+    _sim.gridSize = Point(x ?? gridSize.x, y ?? gridSize.y);
   }
 
-  Point<int> get gridSize => _es.engine.gridSize;
+  Point<int> get gridSize => _sim.gridSize;
 }
diff --git a/lib/service/simulation_service.dart b/lib/service/simulation_service.dart
index 1081bf0..45a7b09 100644
--- a/lib/service/simulation_service.dart
+++ b/lib/service/simulation_service.dart
@@ -1,19 +1,27 @@
+import 'dart:math';
+
 import 'package:rules_of_living/service/engine_service.dart';
 
 class SimulationService {
-  final EngineService engine;
+  final EngineService _engine;
 
-  SimulationService(this.engine);
+  SimulationService(this._engine);
 
   void reset() {
-    engine.reset();
+    _engine.reset();
   }
 
   void addRandomPattern() {
-    engine.addRandomPattern();
+    _engine.addRandomPattern();
   }
 
   void clear() {
-    engine.clear();
+    _engine.clear();
   }
+
+  void set gridSize(Point size) {
+    _engine.engine.gridSize = size;
+  }
+
+  Point<int> get gridSize => _engine.engine.gridSize;
 }
diff --git a/test/service/configuration_service_test.dart b/test/service/configuration_service_test.dart
index 44e23b2..9aa4893 100644
--- a/test/service/configuration_service_test.dart
+++ b/test/service/configuration_service_test.dart
@@ -3,6 +3,7 @@ import 'dart:math';
 import 'package:mockito/mockito.dart';
 import 'package:rules_of_living/service/configuration_service.dart';
 import 'package:rules_of_living/service/engine_service.dart';
+import 'package:rules_of_living/service/simulation_service.dart';
 import 'package:rules_of_living/src/Engine.dart';
 @TestOn('browser')
 import 'package:test/test.dart';
@@ -12,12 +13,13 @@ class MockEngine extends Mock implements Engine {}
 void main() {
   ConfigurationService sut;
   EngineService engineService;
+  SimulationService simService;
   MockEngine me;
   setUp(() {
     me = MockEngine();
     engineService = EngineService();
     engineService.engine = me;
-    sut = ConfigurationService(engineService);
+    sut = ConfigurationService(engineService, simService);
   });
 
   group("simulation speed", () {