This video, the 20th video in the series Homework, Research, and Statistics, demonstrates a method for measuring the effectiveness of various key prices as reversal prices or pivot points. Key prices might be overnight high, overnight low, previous high, previous low, etc. It measures their effectiveness by counting the number of times price reversed the following day/session at these prices using the endpoints of the Zig Zag indicator. Buttons are provided to allow the user to tweak the minimum price change (in ticks) of the Zig Zag as well as the wiggle room (in ticks) allowed for the price movement with respect to reversing inside or reversing just outside the key price. Apologies for the minor glitches in audio during this video.