For my senior project, my group members and I were building an adapter for the iron-gym. The scope of it was just a commercialized product to be used in conjunction with another product. The target audience was really suited towards athletes and fitness minded individuals. Our project is meant to undergo a lot of stress and so testing for failure and breakage was the big functional requirement we had to test for. One of our milestones was to run a simulation for this and to have this simulation confirm that our project/product could handle x amount of weight capacity. However, since the simulation was really complex we figured in the meantime we could build a prototype with weaker material and physically test it ourselves with varying weight capacities that eventually led up to our target weight. We showed our project manager, our professor, and it was a valid substitute for the time being. This allowed us to continue with the dependent steps and actually start gathering materials for the actual final product.