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diff --git a/engine/__pycache__/utils.cpython-36.pyc b/engine/__pycache__/utils.cpython-36.pyc
deleted file mode 100644
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diff --git a/engine/mechanismExecutor.py b/engine/mechanismExecutor.py
index b3fe0f3..37fdab4 100644
--- a/engine/mechanismExecutor.py
+++ b/engine/mechanismExecutor.py
@@ -21,8 +21,12 @@ def mech_step(m_step, sL, state_funcs, behavior_funcs, env_processes, t_step):
 
     _input = getBehaviorInput(m_step, sL, last_in_obj, behavior_funcs)
 
-    for f in state_funcs:
-        f(m_step, sL, last_mut_obj, _input)
+    # OLD: no bueno! Mutation Bad
+    # for f in state_funcs:
+    #     f(m_step, sL, last_mut_obj, _input)
+
+    # New
+    last_mut_obj = dict([ f(m_step, sL, last_mut_obj, _input) for f in state_funcs ])
 
     apply_env_proc(env_processes, last_mut_obj, last_mut_obj['timestamp'])
 
diff --git a/test.py b/test.py
index 21e3670..43e5f85 100644
--- a/test.py
+++ b/test.py
@@ -1,2 +1,4 @@
 from engine import run
-run.main()
\ No newline at end of file
+from tabulate import tabulate
+result = run.main()
+print(tabulate(result, headers='keys', tablefmt='psql'))
\ No newline at end of file
diff --git a/ui/__pycache__/config.cpython-36.pyc b/ui/__pycache__/config.cpython-36.pyc
deleted file mode 100644
index 66450cb..0000000
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diff --git a/ui/config.py b/ui/config.py
index 0a23d3d..956bfcd 100644
--- a/ui/config.py
+++ b/ui/config.py
@@ -29,29 +29,47 @@ def b2m3(step, sL, s):
 
 # Internal States per Mechanism
 def s1m1(step, sL, s, _input):
-    s['s1'] = s['s1'] + _input
+    y = 's1'
+    x = s['s1'] + _input
+    return (y, x)
 def s2m1(step, sL, s, _input):
-    s['s2'] = s['s2'] + _input
+    y = 's2'
+    x = s['s2'] + _input
+    return (y, x)
 
 def s1m2(step, sL, s, _input):
-    s['s1'] = s['s1'] + _input
+    y = 's1'
+    x =  s['s1'] + _input
+    return (y, x)
 def s2m2(step, sL, s, _input):
-    s['s2'] = s['s2'] + _input
+    y = 's2'
+    x =  s['s2'] + _input
+    return (y, x)
 
 def s1m3(step, sL, s, _input):
-    s['s1'] = s['s1'] + _input
+    y = 's1'
+    x = s['s1'] + _input
+    return (y, x)
 def s2m3(step, sL, s, _input):
-    s['s2'] = s['s2'] + _input
+    y = 's2'
+    x =  s['s2'] + _input
+    return (y, x)
 
 # Exogenous States
 proc_one_coef_A = 0.7
 proc_one_coef_B = 1.3
 def es3p1(step, sL, s, _input):
-    s['s3'] = s['s3'] * bound_norm_random(seed['a'], proc_one_coef_A, proc_one_coef_B)
+    y = 's3'
+    x = s['s3'] * bound_norm_random(seed['a'], proc_one_coef_A, proc_one_coef_B)
+    return (y, x)
 def es4p2(step, sL, s, _input):
-    s['s4'] = s['s4'] * bound_norm_random(seed['b'], proc_one_coef_A, proc_one_coef_B)
+    y = 's4'
+    x = s['s4'] * bound_norm_random(seed['b'], proc_one_coef_A, proc_one_coef_B)
+    return (y, x)
 def es5p2(step, sL, s, _input): # accept timedelta instead of timedelta params
-    s['timestamp'] = ep_time_step(s, s['timestamp'], seconds=1)
+    y = 'timestamp'
+    x = ep_time_step(s, s['timestamp'], seconds=1)
+    return (y, x)
 
 # Environment States
 def env_a(x):