When the actions are recorded as a function of time, i.e. when they include information relating to the time and date of execution, {HEAD ~ the recorded information} can be used as {TAIL ~ a valuable source} of statistical information 
used as
When the actions are recorded as a function of time , i.e. when they include information relating to the time and date of execution , { HEAD ~ the recorded information } can be used as { TAIL ~ a valuable source } of statistical information
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH