The following papers are reviewed: 1. 1. Flow charting and custom programming by G. A. Yaeger, Honeywell Commercial Division, Arlington Heights, Illinois. 2. 2. The effect of EMCS architecture on direct digital controllers by G. R. Sapienze, MCC Powers, Northbrook, Illinois. 3. 3. Z-transforms as an aid to DDC system analysis by C. E. Rohrer, Johnson Controls, Milwaukee, Wisconsin and W. F. Stoecker, University of Illinois, Urbana, Illinois. 4. 4. Control fundamentals apply more than ever to DDC by D. A. Coggan, Coggan Douserv Associates, Montreal, Canada.