This study investigated the reliability and developmental and concurrent validity of the Writing What You Read (WWYR) rubric, an instrument originally designed for use with paper-and-pen-created narratives, for hypermedia productions of students in grades 2 and 3. Four teachers guided their students in a 3-month-long hypermedia/process writing curriculum. The 60 students created narratives in HyperStudies 3.1 on Windows-based computers. In addition to test elements, the narratives contained audio, video, graphic, and hyper-travel elements. Five raters evaluated the hypermedia narratives using the WWYR. Results indicate that, for WWYR values as classroom tool, rater judgments were reliable and valid. However, it is noted that, for WWYR usefulness in guiding educational policy, the reliability and validity issues need to be further evaluated. (Contains 1 figure, 7 tables, and 29 references.) (Author/SLD)