I. Introduction
We will consider the Complex Activity (CA) as a person's purposeful activity with a non-trivial internal structure, with multiple and (or) changing subject, technology, and the role of the activity subject in its target context. Within the complex activity methodology [1], the CA is considered together with the actor performing it, which in general is a complex hierarchical organizational and technical system (OTS). An essential advantage of the CA methodology is the joint consideration of an activity's life cycles, subject, resources, and technologies.