What do you do if a lesson doesn't work well?
Things don't always go according to plan. Give a specific example of when a lesson didn't work. Focus on how you analyzed what went wrong and identified the weaknesses with the lesson. Describe how you went about improving the lesson by various means such as changing the complexity level of the content, using available resources, asking for advice from other teachers and reviewing your classroom management. It is important to acknowledge that failures do happen and indicate that you have the insight and maturity to deal with them.
