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Whilst widely advocated, Games Based Learning (GBL) is still an unproven discipline. Results vary and there is no consensus for how best to teach a set of learning objectives using games. Designers may base their approach on reasonable pedagogical principles but the process of design is still driven largely by intuition and greater resembles craft than science. Humans are notoriously poor at unsupported methodical thinking and relying so much on intuition carries great risk in GBL design. Cognitive Walkthrough (CW) is a technique that improves our ability to predict how a user will understand an interaction. Whilst CW is long established in user-interface design, it should be considered a general purpose technique for crafting experiences where a designer must predict the general thinking process of a user. Extending CW to GBL can help designers expose and question their implicit assumptions and can be …