diff --git a/lib/csys/program.ex b/lib/csys/program.ex
index 64d2ea5..e2e2432 100644
--- a/lib/csys/program.ex
+++ b/lib/csys/program.ex
@@ -61,10 +61,11 @@ defmodule Scopes.CSys.Program do
     basic(msg, scope)
   end
 
-  def basic(msg, scope) do
+  def basic(msg, scope) do  # + proc_ops
     case Shape.head(msg) do
-      [:csys, :set | _rest] -> set(msg, scope)
       [:csys, :data | _rest] -> process_data(msg, scope)
+      #[:csys, :trigger | _rest] -> process_trigger(msg, scope)
+      [:csys, :set | _rest] -> set(msg, scope)
       [:csys, :connect | _rest] -> CSys.connect(msg, scope)
       [:csys, :create, :succ | _rest] -> create_succ(msg, scope)
       [:csys, :create, :pred | _rest] -> create_pred(msg, scope)
@@ -76,6 +77,15 @@ defmodule Scopes.CSys.Program do
 
   # message handlers // proc steps
 
+  def process_value(_msg, _scope, _ops) do
+    #proc ops: 
+    #map_op, (identity)
+    #reduce_op, (+)
+    #trigger_cond,  (>)
+    #modifier_op, (identity)
+    #output_op (forward_or_notify)
+  end
+
   def process_data(msg, scope) do
     data = Shape.data(msg)
     state = CSys.state(scope)
@@ -84,7 +94,7 @@ defmodule Scopes.CSys.Program do
     if value_n >= state.threshold do
       msg = Shape.create(Shape.head(msg), data: %{data | value: value_n})
       CSys.forward(msg, scope) || CSys.notify(msg, scope)
-      state_n = %{state | value: state.bias}
+      state_n = if state.bias, do: %{state | value: state.bias}, else: state
       CSys.update(put_elem(scope, 0, state_n))
     else
       state_n = %{state | value: value_n}