Using the cognitive dimensions

Now that I've finished posting the series of articles on using the cognitive dimensions to evaluate API usability, I've finally gotten around to adding links to each of these articles (see the left hand nav bar at https://weblogs.asp.net/stevencl).

And, now that you've seen the full list of the cognitive dimensions and a detailed description of each, I'd like to ask if you think there are any dimensions missing. Is there some aspect of the usability of an API that you feel is not best described by the current set of dimensions? If so, please go ahead and propose a new dimension. Add a comment with a name for the dimension, a description of the dimensions, values for the end points and the mid point, and a description of how it might be evaluated.