Sometimes the Degree of Fit might seem like comparing apples and oranges. With 90 extremely detailed fits, and 10 high-level gaps, the degree of fit seems high, but it isn’t. 90 extremely detailed gaps, and 10 high-level fits, make the degree of fit seem low. In either case the degree of fit is unreliable and it doesn’t tell you anything at all.
For a degree of fit to be reliable, all the requirements should be specified roughly on the same level of detailedness. If they aren’t, you might have an extremely risky project before you, and you just don’t see it. Or you might have a slam dunk, and you stand scared to death by the non-existent risks you see all over.
In situations such as these you have to level the requirements to get a more meaningful figure, otherwise your Fit Gap Analysis doesn’t serve its purpose.
But how exactly do you tell apples from oranges in a requirements list?