IBM GX20-1971-0 UM010 Flowcharting Template

IBM GX20-1971-0 UM/010 Flowcharting Template

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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.
Edward C. Yourdon, “Users Want too Much from HIPO: Yourdon,” Computerworld, vol. 19, #22, May 31, 1976, p. 24.
Currently not on view
Object Name
Logic Template
date made
ca 1975
Physical Description
paper (overall material)
plastic (overall material)
overall:.1 cm x 25.2 cm x 11.5 cm; 1/32 in x 9 29/32 in x 4 17/32 in
ID Number
nonaccession number
catalog number
Credit Line
Gift of Prof. Michael R. Williams
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Medicine and Science: Mathematics
Science & Mathematics
Flowcharting Templates
Data Source
National Museum of American History
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Structured programming was introduced to IBM by Harlan Mills. He convinced the President of Federal Systems Division to train all programmers in structured programming, starting with management. HIPO diagrams were a natural augmentation of the structured programming idea, and were the structured programming initiative was followed by structured design incorporating state machines and then design concepts that considered parallel programming. Later on Cleanroom concepts were popularized in the Division and elsewhere. Classic books on the subjects were written by Linger, Mills, Witt; and then by Witt, Baker, Merritt.

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