Sample of a spelling error Designing for Users: Testing Software Key Concept: Use the Property Sheet to investigate Form Errors.   Purpose: Identify programming errors.   What Are the Steps? Create an error: misspell the Form Name. Test the Control and Review the error. Correct the error and test again.   What Are the Issues? All programmers need to learn how to troubleshoot mistakes.   Why Use This Method? The Computer Mama suggests that kicking the computer to next Tuesday is not a winning strategy. This lesson offers a more scientific method.