This proposal reports the findings from interviews with construction science students about their visualization of problems in a two-dimensional and a three-dimensional task. The specific research questions focused on the individual characteristics that students identify as influencing their spatial ability to generate internal and external representations. Thematic analysis was used to analyze interview data. The findings showed that the existing instructional model about generating representations internally and externally may need revisions to its sequence and more focus on integrating students' prior knowledge and experience. [For the full proceedings, see ED562107.]