Editing Data processing (section)

== History ==

The [[United States Census Bureau]] history illustrates the evolution of data processing from manual through electronic procedures.

=== Manual data processing ===

Although widespread use of the term ''data processing'' dates only from the 1950s,<ref name=DPuse>{{cite book|title=Google N gram viewer|url=https://books.google.com/ngrams/graph?content=data+processing&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=|access-date=June 26, 2013}}</ref> data processing functions have been performed manually for millennia. For example, [[bookkeeping]] involves functions such as posting transactions and producing reports like the [[balance sheet]] and the [[cash flow statement]]. Completely manual methods were augmented by the application of [[mechanical calculator|mechanical]] or electronic [[calculator]]s. A person whose job was to perform calculations manually or using a calculator was called a "[[Human computer|computer]]."

The [[1890 United States census]] schedule was the first to gather data by individual rather than [[household]]. A number of questions could be answered by making a check in the appropriate box on the form. From 1850 to 1880 the Census Bureau employed "a system of tallying, which, by reason of the increasing number of combinations of classifications required, became increasingly complex. Only a limited number of combinations could be recorded in one tally, so it was necessary to handle the schedules 5 or 6 times, for as many independent tallies."<ref name=Truesdell65>{{cite book|author1-link=Leon E. Truesdell|last=Truesdell|first=Leon E.|title=The development of punch card tabulation in the Bureau of the Census, 1890|year=1965|publisher=United States Department of Commerce|url=https://play.google.com/books/reader?id=MGZqAAAAMAAJ&printsec=frontcover&output=reader&authuser=0&hl=en&pg=GBS.PR1}}</ref>  "It took over 7 years to publish the results of the 1880 census"<ref name=Bohme91>{{cite book|last1=Bohme|first1=Frederick|last2=Wyatt|first2=J. Paul|last3=Curry|first3=James P.|title=100 Years of Data Processing: The Punchcard Century|year=1991|publisher=United States Bureau of the Census|url=https://play.google.com/store/books/details?id=uCeu4sHRLfgC&rdid=book-uCeu4sHRLfgC&rdot=1}}</ref> using manual processing methods.

=== Automatic data processing ===

The term ''[[Electronic data processing|automatic data processing]]'' was applied to operations performed by means of [[unit record equipment]], such as [[Herman Hollerith]]'s application of [[punched card]] equipment for the [[1890 United States census]]. "Using Hollerith's punchcard equipment, the Census Office was able to complete tabulating most of the 1890 census data in 2 to 3 years, compared with 7 to 8 years for the 1880 census. It is estimated that using Hollerith's system saved some $5 million in processing costs"<ref name=Bohme91 /> in 1890 dollars even though there were twice as many questions as in 1880.

=== Computerized data processing ===

Computerized data processing, or [[electronic data processing]] represents a later development, with a computer used instead of several independent pieces of equipment.  The Census Bureau first made limited use of [[electronic computers]] for the [[1950 United States census]], using a [[UNIVAC I]] system,<ref name=Truesdell65 /> delivered in 1952.

=== Other developments ===
The term ''data processing'' has mostly been subsumed by the more general term ''[[information technology]]'' (IT).<ref>{{cite book|title=Google N gram viewer|url=https://books.google.com/ngrams/graph?content=information+technology&year_start=1900&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Cinformation%20technology%3B%2Cc0|access-date=April 28, 2018}}</ref> The older term "data processing" is suggestive of older technologies. For example, in 1996 the ''[[Data Processing Management Association]]'' (DPMA) changed its name to the ''Association of Information Technology Professionals''. Nevertheless, the terms are approximately synonymous.