This year the whole world celebrates the five-hundredth birthday of Nicolaus Copernicus, the famous Polish astronomer and mathematician. In 1543, Copernicus published his book, Concerning the Revolutions of Celestial Spheres, which described a new theory about the relative physical movements of the earth, the planets, and the sun. It was in direct contradiction with the earth-centered theories which had been established by Ptolemy 1400 years earlier.
Charles W. Bachman
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The evolution of storage structures
Data base management systems have grown rapidly in their power and complexity over the 15-year history of data processing on commercially available computers. The original concepts have split, and new terms have been adopted to name and refer to these concepts. The Data Structure Diagram graphic technique is used to illustrate the splitting of the concepts and the structural relations which exist between these concepts at each point in the evolution.
On a generalized language for file organization and manipulation
I would like to speak on what I call a unified or generalized language for file organization and manipulation. I call it unified because some ideas from which disk file languages were developed are perfectly applicable to magnetic tape files, and would be a great improvement on the way we address files on magnetic tape today.
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