Since ancient times, analogy, a marvel of the human mind, has been in use to describe linguistic phenomena that shaped the foundations of grammar and perception of a language as an ordered structure. In linguistics, the analogy is reduced to proportion. In the article, by means of multi-element proportions game, the author presents the role of inference by analogy in explaining cognitive and linguistic processes as well as its participation in speech and above all in morpholo-gical efficiency development. The acquired results pinpointed difficulties which pupils, adolescents and students, including hearing impaired, autistic, Asperger, and intellectually disabled ones, experi-ence in respecting the relationship between form and content. Naturally, a need to deepen the study on the lexical-semantic structure advances, definition of development stages and their characteristic features as well as including morphological efficiency in logopaedic diagnosis and language pro-gramming emerges as a consequence of this research.