In this final paper we talk about delayed speech development in preschool children. In the introductory paragraph we explain the concepts of speech and language, as well as of speech development as a complex process in which the child, parents and educator share mutually intertwined roles. Moreover, in the introduction we illustrate in greater detail the standard progress of speech development in preschool children. Afterwards, comes the crucial point of this final paper. In the fourth chapter, we describe delayed speech development in preschool children and factors that contribute to the speech development disorder. Also, we bring forward some of the key pointers on how to identify children with delayed speech development and emphasize the importance of early diagnosis of speech impediments. In addition, this paper includes a table labelled „Speech and language development characteristics and speech delay symptoms“ with the aim to make speech development and deviations from it more comprehensible. In fifth chapter we present how parents and educators can encourage speech development in preschool children. We also conducted a correlational research in which fifty parents and eight educators completed speech development in preschool children assessment. The aim of the research was to examine correspondence between the assessment of parents and educators, and the results have shown there is no statistically significant difference between the answers of those two groups. We can conclude that in most cases parents and educators share the same opinion on speech development in children included in the research.