Predicting the development effort of multimedia courseware. - Ian Mitchell Marshall; W. B. Samson; P. I. Dugard; W. A. Scott (Inf. Softw. Technol., 1994)

A rigorous framework for measuring development productivity and estimating the effort of multimedia courseware. - Ian Mitchell Marshall; W. B. Samson; P. I. Dugard; A. Castell (WCCE, 1995)

Evaluating courseware development effort estimation measures and models. - Ian Mitchell Marshall (1996)

Code-based analysis of the development effort of a large scale courseware project. - Ian Mitchell Marshall; Simon Price; P. I. Dugard; P. Hobbs; W. B. Samson (Inf. Softw. Technol., 1997)