"Ten years have passed since the Directorate of Intelligence (DI) was reorganized primarily along regional rather than functional lines. Technically, the reorganization was of the National Foreign Assessment Center (NFAC) into the DI. Because the DIKi was a name of much longer standing (January 1952-October 1977), I have chosen to simplify this discussion by talking about the old DI and new DI, with October 1981 as the breaking point between the two."
Center for the Study of Intelligence: https://www.cia.gov/library/center-for-the-study-of-intelligence/index.html
Studies in Intelligence, v.36 no.5, p.45-54