Topicality of the issue under study is caused by the changed socio-economic conditions and socio-technological development of the Russian economy, which resulted in a considerable transformation of the scope of professions in the postindustrial society: these professions disappear, those are transformed and still those appear for the first time ever. Along with conventional concepts of "profession" and "specialty", today's profession studies (or professiology) refer, in increasing frequency, to "transfession" -a new term denoting a type of labour activity which is realized on the basis of synthesis and convergence of professional competences belonging to different specialized scopes. Transprofessionalism as an ability to perform a wide range of specialized activities can be regarded as one of profession studies features. It is signification of socio-humanitarian technologies of development of this integral ability of specialists in the system of continuous education which conditioned topicality of this study. The purpose of this article is reviewing and generalization of bases and prerequisites of transprofessionalism as a socio-humanitarian requirement and an integral quality of a subject of socionomic professions in a dynamically changing socioprofessional environment. Leading methods of studying this issue are theoretical methodological analysis of the subject and issue of the study on basis of examining and logical generalization of scientific sources; plus, hypothetic methodological and project methods can be considered. Description of the transprofessionalism phenomenon was performed with supporting on the multidimensional, transdisciplinary, network and project approaches. The article presents a socio-humanitarian psychology-pedagogical definition of transprofessionalism, its sense-generating content, as well as criteria of transprofessionalism manifestation in a dynamically changing socio-professional environment. Topicality of the transprofessionalism phenomenon as a requirement to a subject in its integral quality demanding the qualitatively new substantial and technological training of socionomic profession specialists has been substantiated. In particular, it is stated that as the world's and Russian socio-technological economy develops, profession as a concept loses its initial meaning as a scope of the social division of labour, while transprofessionals able to perform a wide range of professional activities become competitive and highly sought on an employment market. Materials of the article can be of interest for methodologists, methodology supervisors and pedagogues of continuous vocational education.Keywords: transfession, transprofessionalism, subject of socionomic professions, logic-conceptual model of transprofessionalism Zeer et al. / Theoretical Methodological Basics for Studying of Transprofessionalism 2 / 9