Aspectual formation of Russian verb: prefixation and / or suffixation?

The article discusses the relevance of the verb classifier hypothesis and the multiple prefixation theory with the tertiary imperfectivation constraint for the theory of Russian aspect. An alternative view on the structure of the grammatical aspectual domain in Russian is offered on the basis of these assertions, as well as diachronic corpus research of secondary imperfectivation and a discussion of aspectual-semantic (actional) properties of primary and secondary imperfectives. The structure is viewed as composed of two parallel mechanisms: derivational prefixal perfectivation and inflectional suffixal (secondary) imperfectivation.