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Intel Education offers a great tool called Assessing Projects that helps you develop student-centered assessments of 21st Century Skills.  It has a searchable database of checklists, rubrics and open-text assessments for products, performances, processes and thinking skills.  You can choose to use the assessments as they are, customize them, or create your own from templates.  To learn more, you can try a demo of the tool without signing up or view the brief video overview.  Sign up is free and they have a great tutorial section that will help you get started.