When the actions are recorded as 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 {HEAD ~ a valuable source} of {TAIL ~ statistical information} 
of
When the actions are recorded as 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 { HEAD ~ a valuable source } of { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL