I remember over 25 years ago my first assignment as a co-op the summer between my under graduate and graduate education was "yellow lining" and updating most of the P&IDs for the plant I was working in. I was anxious to do "real engineering" and I didn't understand the usefulness and priority of this assignment. However, I soon realized that task exposed me to more learning about process design and equipment faster than any other thing I could have done. It visibly drove the connection between what I learned in college and practical application and physical understanding of all the things I had studied. My previous co-op was focused on a couple specific projects and was rewarding but this activity was a great way to accelerate a breadth and depth of practical knowledge of chemical processing as I asked questions and clarified the accuracy of the mark-ups.