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.

A report titled, "The development proposal - the first step in software system construction," by Donald Cowan 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-78-31 in June 1978. The cover page of the report includes a note that the research was supported in part by Canadian National Research Council Grant A2655. The report is seventy-six pages.