Two typed manuscripts titled, "Some thoughts on the construction of programs - a data-directed approach" by Donald Cowan and Carlos J. P. Lucena, Departamento de Informática, Pontifícia Universidade Católica, Rio de Janeiro, Brazil. One manuscript is a draft (photocopy) with annotations and is seventeen pages. The second manuscript is a master copy (photocopy) and is five pages.

Two copies of a report titled, "On the concept of modules in programming systems" by Donald Cowan as well as C.J. Lucena and A. von Staa (Departamento de Informática, Pontifícia Universidade Católica, Rio de Janeiro, Brazil). The report was published by the Faculty of Mathematics at the University of Waterloo as Research Report CS-76-05 in January 1976. The report is thirty-nine pages.

Two typed copies of a manuscript titled, "A discussion of the concept of modules in programming systems" by Donald Cowan as well as C.J. Lucena and A. von Staa, Departamento de Informática, Pontifícia Universidade Católica, Rio de Janeiro, Brazil. Both copies (original and photocopy) of the manuscript are twelve pages.

A copy of an article titled, "A data-directed approach to program construction," by Donald Cowan and C.J.P. Lucena (Departamento de Informática, Pontifícia Universidade Católica, Rio de Janeiro, Brazil). This cover page of the article notes that the research was supported by Canadian National Research Grant A2655. The article appears to be published by the Faculty of Mathematics, University of Waterloo.