This paper describes the basic elements a uniied process of generating computer system models. Compositions of elements and their projections on axes of representation (visual, audio, tactile, and linguistic) make it possible to construct diierent algorithmic structures, which have their own syntactic form and operating semantics. Development of compositions is a goal-oriented activity controlled A proposed approach is principally evolutionary one. It is devoted to clarify the fundamental basis of forms and principles of a heterogeneous knowledge represented in a computer. It allows to stratify program synthesis into levels of representation. In particular, some aspects of conceptual synthesis are concerned.