Tree Testing helps you to find where users get lost in your navigation.
Tree testing provides goal-oriented verification of a navigation hierarchy. No other part of the solution is involved since users only interact with a simulation of the menus. In the video William Hudson talks about getting started with tree testing:
References & Where to Learn More
Optimal Workshop’s Treejack (tree-testing tool)
© Daniel Skrok and Interaction Design Foundation, CC BY-SA 3.0