This document discusses and compares white box, black box, and gray box testing methods. White box testing examines internal program structure and logic and requires knowledge of source code. Black box testing examines functionality without knowledge of internal workings. Gray box testing combines aspects of white and black box by having limited internal knowledge. Each method has advantages like code coverage for white box or large tester pools for black box, and disadvantages like cost or limited coverage. The document provides details on each method and how they differ in tester knowledge and perspective.