systems of subsea test tree 22 creation of independent monitoring and control systems means that any problem with the monitoring system 38 causes no effect on the ability of control system 36 to effectively carry out its safety functions with respect to actuation of valve system 28 and or other systems of subsea test tree 22 referring generally to fig2 the relationship between control system 36 and riser instrumentation module system 38 is illustrated in this embodiment control system 36 comprises a subsea control module 44 and a topside control system 46 that are connected with each other via communication line 42 by way of example communication line 42 may comprise a multicore cable having one or more hydraulic control lines in this example the monitoring system 38 comprises a subsea monitoring module 48 and a topside monitoring system 50 that are connected with each other via communication line 40 by way of example communication line 40 may comprise one or more electric fiber optic wireless or other suitable signal communication lines able to convey signals between the subsea location 24 and the surface location 33 the subsea monitoring module 48 is designed to measure and monitor desired parameters such as temperature and pressure in hydraulic control lines used to manipulate valve system 28 and or other systems of subsea test tree 22 communication line 40 and monitoring communication line 42 may be routed as two completely separated cables or the communication lines 40 42 may be combined in a common umbilical 52 if.