Describing a Product Opportunity: A Method of Understanding the User's Environment. - Andrew Hutt; Nick Donnelly; Linda A. Macaulay; Chris J. H. Fowler; Deborah Twigger (BCS HCI, 1987)

USTM: A New Approach to Requirements Specification. - Linda A. Macaulay; Chris J. H. Fowler; Mark A. R. Kirby; Andrew Hutt (Interact. Comput., 1990)