Experience with data processing must be included in courses dealing with computer science. A series of examples of data processing problems suitable for classroom use is presented. (SD)

The students in a low-ability first-year classroom of a secondary school use a questionnaire and punched cards to collect and organize data about their classmates. The first five minutes and the first four minutes after the first quarter of an hour of the resulting class discussion are included. (MN)

Results are reported from a study examining computer usage in high schools that have had computer facilities for many years. (MP)

Cryptography is the science that renders data unintelligible to prevent its unauthorized disclosure or modification. Presents an application of matrices used in linear transformations to illustrate a cryptographic system. An example is provided. (17 references) (MDH)