diff --git a/AlgebraicDataflowArchitectureModel/models/Observer.model b/AlgebraicDataflowArchitectureModel/models/Observer.model
new file mode 100644
index 0000000..2d0a90a
--- /dev/null
+++ b/AlgebraicDataflowArchitectureModel/models/Observer.model
@@ -0,0 +1,14 @@
+channel TimePasses {
+    out weather(cur:Json, timePasses(nextWeather:Str)) = {"currentWeather": nextWeather, "observers": cur.observers}
+}
+
+channel AddObserver {
+    out weather.observers(cur:List, addObserver(obs:Json)) = append(cur, obs)
+}
+
+channel Notify {
+    in weather(cur, notify(next.currentWeather)) = next
+    for EachWeatherObserver(obsNo:Int) {
+        out weather.observers.{obsNo}(curState:Json, notify(nextWeather)) = nextWeather
+    }
+}