SPEM — Activity and step (p. 7-4)

Activity and step (p. 7-4)
The specification document states: "Although it is not explicitly
prohibited, an Activity does not normally use the subWork structure
inherited from WorkDefinition; instead decomposition within Activity is done
using Steps". Steps are atomic elements. In practice, this constraints
activity de-composition to two levels. We believe that this is not enough to
model detailed and fine-grained processes.
Proposed resolution: Remove Step from the metamodel and use the association
parentwork-subwork to model Activity decomposition too.

Reject. The presence of Step does not constrain activity decomposition