Designers implement a variety of models and representations during the design process, yet little is known about the cognitive impacts of various representations.This study focuses on how physical models can assist novices in mitigating design fixation to undesirable features. During idea generation, designers tend to fixate on examples they encounter or their own initial ideas. The first hypothesis states that designers tend to duplicate features of provided examples. The second hypothesis states that this fixation can be mitigated with appropriate warnings. The last hypothesis is that building and testing physical models can help designers in mitigating fixation. To investigate these theories, a quasi-experiment is conducted as Copying these flawed features creates more complicated and less effective designs.However, through the physical testing of their designs, participants identify and fix the design flaws. These results indicate that existing designs and experiences have the potential to limit innovation and that designers need to be trained with effective methods for mitigating design fixation. Building prototypes can help designers in identifying the flawed features and in reducing design fixation; hence the use of physical models in engineering design needs to be encouraged.