Ontology of Planning

Erik Thomsen, William Duncan, Tatanya Malyuta and Barry Smith, “A Computational Framework for Living Plan Specification, Execution and Evaluation” Proceedings of the Conference on Semantic Technology in Intelligence, Defense and Security (STIDS), George Mason University, Fairfax, VA, November 18-20, 2014.

Austin Tate, Towards a Plan Ontology (1996)

Austin Tate Plan Ontology Page

Planning Initiative Shared Planning and Activity Representation - SPAR (1997)

Philip R. Cohen and C. Raymond Perrault, Elements of a Plan‐Based Theory of Speech Acts (1979)

Summarized here