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