The author presents considerations on logopaedics as a science, exposing the interdisciplinary character of this discipline. The problem discussed in the paper is depicted in the context of two processes observed in science, namely dividing and combining knowledge. Against this background the author analyzes the subject and tasks of logopaedics, taking into account linguistics, pedagogy and psychology. She also presents preliminary results of survey research concerning the understanding by speech therapists of the interdisciplinarity of logopaedics, the specific nature of diagnosis and therapy methods which, in the opinion of respondents, are specific to logopaedics. She also points to the major tasks of logopaedics which are connected with ordering the methodology of proceeding and the education process.