diff --git a/AlgebraicDataflowArchitectureModel/models/SimpleUI.model b/AlgebraicDataflowArchitectureModel/models/SimpleUI.model
index 9b54346..3e03bbd 100644
--- a/AlgebraicDataflowArchitectureModel/models/SimpleUI.model
+++ b/AlgebraicDataflowArchitectureModel/models/SimpleUI.model
@@ -1,7 +1,12 @@
 init {
-	screen := {"widgets": {"001": {"type": "button", "text": "OK", "state": 0}, 
-							"002": {"type": "textInput", "text": "", "state": 0}}, 
-				"layout": true}
+	screenTemplates := {
+				"000": {"widgets": {"001": {"type": "textInput", "text": "", "state": 0}, 
+									"002": {"type": "button", "text": "Next", "state": 0}}, 
+						"layout": true},
+				"001": {"widgets": {"003": {"type": "label", "text": "label", "state": 0}, 
+									"004": {"type": "button", "text": "Back", "state": 0}}, 
+						"layout": true}
+				}
 }
 
 native channel ScreenUpdate {
@@ -44,6 +49,16 @@
 	out screen.widgets.{wid}.text(curText: Str, textEvent(nextText)) = nextText
 }
 
+channel ChangeCurScreen {
+	out curScreen(curScId: Str, changeCurScreen(nextScId)) = nextScId
+}
+
+channel ScreenTransition {
+	in curScreen(curScId: Str, transScreen(nextScId, nextSc)) = nextScId
+	in screenTemplates.{nextScId}(curSc, transScreen(nextScId, nextSc)) = nextSc
+	out screen(curS, transScreen(nextScId, nextSc)) = nextSc
+}
+
 channel ChangeLayout {
 	out screen.layout(curLayout: Bool, changeLayout(layout)) = layout
 }
@@ -78,4 +93,4 @@
 
 channel AddMovableTextInput {
 	out screen.widgets(widgets: Map, addMovableTextInput(wid: Str, x: Int, y: Int, width: Int, height: Int)) = insert(widgets, wid, {"type": "textInput", "text": "", "x": x, "y": y, "width": width, "height": height, "state": 0})
-}
+}
\ No newline at end of file