EN
Speech delay and developmental aphasia are units of abnormal speech and language development in a small child. Their fi rst symptoms can appear as early as at the beginning of the linguistic development, i.e. ca. at the age of 1, and can be quite similar. Differentiating between such units not seldom requires a long and meticulous speech assessment and a systematic observation of speech and language development dynamics in a child during the improvement process. It is a difficult task in particular for young and inexperienced speech therapists who are at the beginning of their career. This paper presents certain tips which could enable a more precise and correct diagnosis of children’s linguistic and extra-linguistic behaviours that are characteristic of such units.