As a project Manager you can provide feedback to your team in following way
Provide positive Feedback First
Make sure that you first focus on achievements – just the good news. One of the factors that make working together so difficult is our habit of focusing on issues and problems to the exclusion of achievements and successes. In such an environment people feel undervalued and unmotivated and a feeling of Why bother? Shapes the culture.
Review Failures
Next take time to review failures, asking the team to make a full list of disappointments. Let them know that this exercise has nothing to do with pointing fingers and everything to do with creating a realistic picture of the current status of the team and the business.
Take the Lessons
Finally ask each team member to consider what can be learned from what happened. Discuss the potential lessons and align on the top three guidelines that would make the most difference to your success. Keep these alive throughout the year by regular review and public display with news of the difference the lessons are making to performance.