Machine implemented {HEAD ~ activity management system} using asynchronously shared activity data objects and {TAIL ~ journal data items} 
Machine implemented { HEAD ~ activity management system } using asynchronously shared activity data objects and { TAIL ~ journal data items }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL