Same as any other schemes assessment I guess - trying to see how competent you are. Have you thought of asking NAPIT what the assessment consists of? Most schemes will give you a checklist of what they want to see at an assessment but the practical element can consist of virtually anything in the Big Red Book.
Plenty of threads on this - different people like different schemes for different reasons. Many say NICEIC are a pain and make up their own rules. Some say ELECSA & NAPIT are more friendly and pragmatic. Many do nothing apart from seeing their assessor once a year. Pays your money take you pick - whatever is best for your business.
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