In 1959 and 1960, when the Committee on Economic Stability of the Social Science Research Council (SSRC) was planning a project for constructing an econometric model of the United States on a cooperative basis, Geoffrey Moore put forward some ideas that have proved to be unforgettable for me. I have often referred back in my own mind to his contributions to the discussion, either in the form in which they were originally cast, or as stimuli for related ideas that have significance for econometric model construction. While the different committee members were trying to piece together patterns of research personnel and work to be done for relevant sectors (housing, business investment, money market, input-output flows, agriculture, and the like), Geoffrey Moore suggested that it was important to include the leading indicators of cyclical activity explicitly in the composite model.