As a climate scientist I work with many different atmospheric weather and climate models. Each model has hundreds of thousand to million+ lines of code written by many different contributors. There is no way to personally understand everything that happens within the model, so when developing new model components or debugging problems I frequently have to traverse through many levels of subroutines and search through many different variables. Scitool’s Understand makes this quick and efficient. I have been using Understand for about seven years and it has saved me weeks of time and assisted in fixing some very tricky issues in the models. It has more than paid back its cost in labor saved.