In this article, I review the definition of the grammatical units and the criteria for analysis of the units to be used in the field of speech-language pathology. Many researchers of communication disorders, perform a linguistic analysis in order to discover the communication problems and find appropriate intervention strategies. Grammatical units could be used for detection and assessment of communication problems. This result of unit analysis is used to define the goals and methods of intervention for the disorders. This linguistic knowledge and description of the criteria for accurate analysis might be shared with speech-language pathologists. However, It is insufficient whether this knowledge of grammatical units for use in communication disorders is suitable. There are three types of the units that are used widely in the field of speech-language pathology, morpheme, word and eojeol. It has to be re-examined for the definition and the criteria of the units for linguistic analysis. And there are considerable differences between definitions presented in school grammar and the results from analyzing actual data. This may be due to the data type of communication was primarily spoken data. However, I guess the more fundamental problem is that the current grammar systems have the asymmetric position of the word endings. For effective analysis in the field of at least speech-language pathology, it is necessary to ensure the consistency of the analysis criteria. So I suggested a way to simplify the units to dual stages of grammatical units for analysis in the field of communication disorders. The larger units as components of the sentence are based on the independency, and the smaller units are corresponding with the revised word include the word endings. Of course, this proposal is to be verified through the application of some of the actual spoken data.