diff --git a/src/zoix.py b/src/zoix.py
index b773e4e..cee8e10 100644
--- a/src/zoix.py
+++ b/src/zoix.py
@@ -7,6 +7,7 @@
 import re
 import enum
 
+######## TEMPORARY ########
 log = logging.getLogger("testcrush logger")
 log.setLevel(logging.DEBUG)
 log_stream = logging.StreamHandler(stream = sys.stdout)
@@ -17,6 +18,7 @@
 log_file.setFormatter(logging.Formatter('%(lineno)d:[%(levelname)s|%(module)s|%(funcName)s]: %(message)s'))
 log.addHandler(log_stream)
 log.addHandler(log_file)
+###########################
 
 class LogicSimulation(enum.Enum):
     TIMEOUT = 0 # Endless loop
@@ -33,6 +35,10 @@ class Compilation(enum.Enum):
     ZOIX_ERROR = 0 # stderr contains text
     SUCCESS = 1 # None of the above
 
+class FaultSimulation(enum.Enum):
+    TIMEOUT = 0 # Wall-clock
+    FSIM_ERROR = 1 # stderr contains text
+    SUCCESS = 2 # None of the above
 class ZoixInvoker():
 
     def __init__(self, fsim_threads : int) -> 'ZoixInvoker':
@@ -107,6 +113,12 @@ def logic_simulate(self, *instructions : str, **kwargs) -> LogicSimulation:
                 - success_regexp (re.regexp): A regular expression which is
                 used for matching in every line of the `stdout` stream to
                 signify the sucessfull completion of the logic simulation.
+                - tat_regexp_capture_group (int): An integer which corresponds
+                to the index of the TaT value on the custom regexp (if provided).
+                By default is 1, mapping to the default `success_regexp` group.
+                - tat_value (list): An empty list to store the value of the
+                tat after being successfully matched with `success_regexp`.
+                Pass-by-reference style.
         - Returns:
             - LogicSimulation (enum):
                 - TIMEOUT: if user defined timeout has been triggered.
@@ -121,10 +133,25 @@ def logic_simulate(self, *instructions : str, **kwargs) -> LogicSimulation:
         # $finish at simulation time  XXXXXXYs
         # where X = a digit and Y = time unit.
         # Capturing of the simulation duration
-        # done for possible TaT purposes. TODO
+        # done for possible TaT purposes.
         success : re.regexp = kwargs.get("success_regexp",
             re.compile(r"\$finish[^0-9]+([0-9]+)[m|u|n|p]s", re.DOTALL))
 
+        # By default, a single capturing  group
+        # is expected in the regexp, which maps
+        # to the TaT value. If a custom  regexp
+        # is provided however, with >1  groups,
+        # then the user must specify  which  is
+        # the expected capture group.
+        tat_capture_group : int = kwargs.get("tat_regexp_capture_group", 1)
+
+        # An empty mutable container is expected
+        # to store the TaT  value  matched  from
+        # the regexp. It is used  like  that  to
+        # mimic a pass-by-reference and not alter
+        # the function's return value.
+        tat_value : list = kwargs.get("tat_value", [])
+
         simulation_status = None
 
         for cmd in instructions:
@@ -134,37 +161,67 @@ def logic_simulate(self, *instructions : str, **kwargs) -> LogicSimulation:
             if stderr and stderr != "TimeoutExpired":
 
                 log.debug(f"Error during execution of {cmd}\n\
-                ---------[MESSAGE]---------\n\
-                {'-'.join(stderr.splitlines(keepends=True))}\n\
+                ------[STDERR STREAM]------\n\
+                {'-'.join(stderr.splitlines(keepends = True))}\n\
                 ---------------------------\n")
 
                 simulation_status = LogicSimulation.SIM_ERROR
                 break
 
             elif stderr == stdout == "TimeoutExpired":
+
                 simulation_status = LogicSimulation.TIMEOUT
                 break
 
             for line in stdout.splitlines():
+
                 log.debug(f"{cmd}: {line.rstrip()}")
 
-                if re.match(success, line):
-                    log.debug(f"SIMULATION SUCCESSFULL: {re.match(success, line).groups()}")
+                end_reached : re.Match = re.search(success, line)
+
+                if end_reached:
+
+                    test_application_time = end_reached.group(tat_capture_group)
+
+                    try:
+                        tat_value.append(int(test_application_time))
+
+                    except ValueError:
+                        raise LogicSimulationException(f"Test application time was not correctly captured \
+'{test_application_time=}' and could not be converted to an integer. Perhaps there is something wrong with\
+your regular expression '{success}' ?")
+
+                    log.debug(f"SIMULATION SUCCESSFULL: {end_reached.groups()}")
                     simulation_status = LogicSimulation.SUCCESS
                     break
 
         if not simulation_status:
-            raise LogicSimulationException(f"Simulation status was not set during\
-            the execution of {instructions}. Check the debug log for more information!")
+            raise LogicSimulationException(f"Simulation status was not set during \
+the execution of {instructions}. Is your regular expression correct? Check the debug log for more information!")
 
         return simulation_status
 
+    def fault_simulate(self, *instructions : str, **kwargs) -> FaultSimulation:
+        ... # TODO
+
 def main():
     """Sandbox/Testing Env"""
     A = ZoixInvoker(16)
     #A.logic_simulate("for i in $(seq 100000); do echo $i; done", timeout = 0.1)
-    res = A.logic_simulate("cat oksimlog.log", timeout = 60.0)
+
+    tat_dict = {
+        "success_regexp" : re.compile(r"test application time = ([0-9]+)"),
+        "tat_regexp_capture_group" : 1,
+        "tat_value" : []
+    }
+
+    res = A.logic_simulate("cat logic_sim_excerpt.log",
+        timeout = 60.0,
+        **tat_dict)
+
+    print(tat_dict['tat_value'])
     print(res)
+
 if __name__ == "__main__":
 
     main()