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This is a very nice tool to use for additional exercises to topics on programming. It allows you to choose a language, such as PHP. Each time exercises are completed it monitors and keeps a list of what you have completed. We could use this for students and track their progress. Disadvantage: When you make an error on the exercises the error messages are not very helpful. Does not provide feedback that can "scaffold" the student out of the error. Nice tool and definite one for use next year.