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Is it possible your son is a perfectionist? I sometimes procrastinate because of this. I worry that the work I will do won't be up to my high standards, and so I avoid doing it at all until the last minute. It also takes me a long time to make decisions, and so "easy" projects can take an unreasonable length of time to complete. (For example, we haven't had our house painted in years: what color? what kind of paint? whom should we hire to do the work? what time of year is best? etc. I strongly suspect an NT household would have just done it. Me, I worry I'll regret one or more of my decisions, so I put off making any decisions. Maybe I should be researching house paint right now, but instead I am responding to forum posts!)
Well said!

These resources have been posted on other threads, but in case the OP may not be familiar with them... There are books which show readers how to free themselves from thought patterns which may not be serving them well. While insightful, these books are written gently for kids, in a style that is fun and engaging. Parents may wish to pre-read and decide if a resource may be a helpful tool for their child. For example, one book which seems to understand perfectionism very well and which many find supportive is What To Do When Good Enough Isn't Good Enough. Another book many like is Perfectionism: What's Bad About Being Too Good. Here is an article from the Davidson Database, Interview with Thomas Greenspon on Perfectionsim.