This study investigates how shared mental models (SMMs) change over time in teams of students in a manufacturing engineering course. A complex ill-structured project was given to each team. The objective of the team project was to analyze, test, and propose ways to improve their given manufactured product. Shared mental models were measured in terms of Team-SMM and Task-SMM. Specifically, each Team-SMM and Task-SMM was measured in Team-SMM Structure, Team-SMM Degree, Task-SMM Structure, and Task-SMM Degree. The research question was answered by using one-way repeated measures ANOVA. Results supported that shared mental models (Team-SMM and Task-SMM) changed over time. The changes also varied differently depending on measuring the structure and degree of SMMs. (Contains 1 figure and 2 tables.)