Presentation is one of the important activities in research to publish research results. When we create presentation documents (P-documents for short), it is important to compose presentation structure (P-structure for short) that represents what to present and how to sequence the contents. To create proper P-documents, we need to learn how to create P-documents in the lab. In our previous work, we have helped unskilled researchers with presentation schema (P-schema for short), which is represented as an all-inclusive P-structure of P-documents accumulated in the lab. It allowed unskilled researchers to create proper P-documents. But, some learners could not properly segment research contents into slides. To solve this problem, this paper describes refinement of P-schema. This paper also reports a case study whose purpose was to assess whether the refined P-schema could promote segmentation by comparing P-documents and P-structure composed with the refined P-schema and composed with the original P-schema. [For the complete proceedings, see ED579395.]