Kalenjin is a cover term used to refer to a group of dialects that belong to the nilotic group of the Chari- Nile language group of Africa. The Kalenjin dialects are Kipsigis, Nandi Keiyo, Tugen, Sebeei, Pokot and Okiek among other smaller groups. The speakers of these dialect groups enjoy a significant level of mutual intelligibility. However, this mutual intelligibility is not uniform across all the dialects. Pokot speakers do not seem to enjoy mutual intelligibility with other dialects. This book analyses the morphosyntactic and lexical structure of Pokot, Kipsigis and Tugen with an aim of coming up with viable explanations for the lack of mutual intelligibility between Pokot and other Kalenjin speakers. This book is useful to all linguists who wish to understand the Kalenjin language better. It offers valuable literature to all those conducting research in Kalenjin, a language with little documentation and records. It is insightful to those who would want to develop Kalenjin grammars and orthographies. It''s a good read to those who wish to gain general knowledge about languages of the world and African languages in particular.