IBM GX20-1971-0 UM/010 Flowcharting Template

Description:

This rectangular clear green plastic template has nineteen symbols relating to flowcharting and structured programming cut out of it. These are explained on the paper sleeve. The template has a nine inch scale, divided to tenths of an inch, across the top, a nine inch scale divided to eighths of an inch across the bottom, a three inch scale divided to twelfths of an inch on the right, and a scale nine centimeters long divided to millimeters on the left. A mark on the right reads: HIPO. Another mark reads: GX20-1971-0 UM/010. Another mark reads: IBM.

HIPO (Hierarchy plus Input Process Output) was a design aid and documentation technique developed by IBM in the 1970s.

Reference:

Edward C. Yourdon, “Users Want too Much from HIPO: Yourdon,” Computerworld, vol. 19, #22, May 31, 1976, p. 24.