When planning and executing any project it is almost normal to fall of schedule I believe. Even when developing a gantt chart there is a critical path and supplementary paths that allow time for slow downs or hiccups. When running my own capstone project, we saw hiccups that are very hard to account for like shipping and manufacturing times. Also, since our project is being developed to function in a hospital setting there are increased costs for materials due to regulations and higher levels of quality. Some materials were in within days and others are still delayed by weeks. I also feel like a budget relies on making sure there is a surplus budget for unexpected failures. Using an entire budget early in a project will leave you inevitably guaranteed to land over budget. Even with no cost planed or even extra material purchased a capped budget will eventually incapable of moving forward.