When I first started working with the SDI back in the 1990s, I made a mistake that turned into a learning opportunity.
I had an appointment with a senior training officer at a large corporation. She had completed the paper version of the SDI in advance (this was the era of mailing paper assessments and using pencils—how did we survive?). Since I hadn’t seen her results yet, she read her six numbers over the phone, and I plotted them on a laminated SDI triangle on my desk.