This paper reports on a study in which developers' cognitive levels were categorised and measured while they mapped a sequence diagram to the related code based on a Usage Based Reading scenario. Results indicate that applying the usage-based reading technique to map a sequence diagram to the underlying code, facilitates a developer to operate at the Knowledge and Comprehension levels of Bloom's cognitive taxonomy, but does not facilitate sustaining it at the Analysis level. The results of this

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... study highlight the need for improved tools and methodologies that aid developers understanding of the system, particularly for those commencing a new project.