A.15.1:3 - Forces (what the definition must balance)

Force	Tension we resolve
Universality vs. domain detail	One Work notion for surgery, welding, ETL, proofs, lab cycles—while letting each keep its vocabulary.
Granularity vs. aggregation	Selected-grain occurrences vs. composite Work; we need roll-up without presuming partlessness or letting Work parthood create another object’s composition.
Concurrency vs. order	Parallel or overlapped activities need clear part and overlap semantics.
Identity vs. retries	A failed attempt, a retry, and a resumed episode—what is “the same” work?
Time realism vs. simplicity	We need intervals and coverage but cannot bury users in temporal logic notation.