Purpose: Speech-language pathologists (SLPs) work with students with specific language impairment and specific learning disorder who are known to have deficits in morphological knowledge and morphological awareness. Thus, it is important that SLPs have explicit knowledge of morphology to classify, elicit, and correct morphological errors to improve these students' morphological knowledge and morphological awareness. The purposes of this clinical focus article are to summarize current evidence about SLPs and other educators' explicit knowledge of language, to identify information that supports explicit knowledge of morphology, and to illustrate the use of explicit knowledge of morphology with a hypothetical case study. Method: A case-based demonstration of an SLP's use of his/her explicit knowledge of morphology to analyze a fourth-grade student's production of derivational morphemes in a spoken language sample and on a sentence completion task is presented. Results and Conclusion: The SLP's morphological analyses and summarization of the analyses are presented.