I just completed AI's 510 course in advanced income cap. When I took 310 a couple of years ago, it was the roughest week-long course I'd ever endured. This includes some pretty tough courses in the avaiation field needed to achieve an Airline Transport Pilot's certificate for Rotorcraft/Helicopters. But I'm afraid I've met my match. 510 kicked my azz off. It will be a major miracle if I passed that test. There were a half-dozen questions which ended with "What is the value of the property?" I could not affirmatively answer a single one of them. But I did manage to pick up a little better understanding of how to support yield rates, partitioning IRR, sensitivity analysis, and a bunch of other neat stuff that I won't be able to put to immediate use here in rural Tennessee. Spent about 60% of my time fighting that (*&*&%^^ HP12-C calculator. There's an algorithm in its firmware which always produces a wrong answer first, forcing you to recalculate the problem. Why, why, why do purveyors of modern analysis techniques force you to use an antique calculator to solve problems better analyzed on a spreadsheet? I asked that question to one of the instructors. He said that in one recent class, four of the students had worked for a CG who didn't even own a spreadsheet program!!! Talk about a one-legged man in a butt-kicking contest! IMO, one whose primary business is commercial appraisal should have two essential skills: A thorough knowledge of his word processor's advanced capabilities, and a thorough knowledge of how to operate a spreadsheet. Macro programming would be a good bonus skill to have. I just [know] I'm gonna have to re-take that course.