The area of concern to Dr. Wietske Noordman Vonk has been variously seen as an aspect of long-term memory F. I], secondary memory F. 2], memory without record F. 3], and semantic memory F. 4J, the latter term being the one pre ferred by Dr. Noordman-Vonk herself. This proliferation of terminology is not an entirely trivial matter, for although the expressions clearly overlap in range, they do draw attention to different features of the phenomena under consideration. The work reported here is concerned with the form of representation and manipulation of our knowledge that, for example, a...