olemus
(a) sõltub kontekstist, tihti moesõna

https://www.igi-global.com/dictionary/establishing-the-program-management-office/70997

https://projectworkout.wordpress.com/2010/12/28/what-on-earth-is-a-workstream/

(b) töörühma(de) tegevuste kogum
Wiktionary:
the organised output of several distinct, and often unrelated, work groups

IBM:
a no-code collaboration that brings together activities, data, documents, and people to deliver a business outcome

vt ka
- tegevusliin; tegevussuund
- töövoog