You never want to give any indication of any weaknesses that you have. Turn you weaknesses into strengths by working it to the employer's advantage.

I am the type of person or is very hard on myself. I am always expecting myself to do a little bit more. However, I guess this works out well for my employer.

I never like to leave work until I have every thing finished completely. Sometimes this bothers me but I feel inside that it is important.

I am the type of person who always takes my work home with me. This sometimes interferes with my personal life but I feel that work comes first.