Seven Common Usability Testing Mistakes

Mistake #1: Do You Know Why You're Testing?
Mistake #2: Not Bringing the Team Together
Mistake #3: Not Recruiting the Right Participants
Mistake #4: Not Designing the Right Tasks
Mistake #5: Not Facilitating the Test Effectively
Mistake #6: Not Planning How You'll Disseminate the Results
Mistake #7: Not Iterating to Test Potential Solutions
Read in detail (Courtesy: User Interface Engineering)