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