Structured model development techniques. - Ronald R. Willis (ANSS, 1974)

Computer system modelling: A test bed for new software technologies. - Ronald R. Willis (WSC, 1974)

DAS: An automated system to support design analysis. - Ronald R. Willis (DAC, 1978)

Computer Aided Design of Software Systems. - R. R. Willis; E. P. Jensen (ICSE, 1979)

Techniques in simulation which enhance software reliability. - Ronald R. Willis (SIGMETRICS Perform. Evaluation Rev., 1979)

GMSS graphic modelling and simulation system. - R. R. Willis; W. P. Austell (ANSS, 1983)

Software Process Improvement at Hughes Aircraft. - Watts S. Humphrey; Terry R. Snyder; Ronald R. Willis (IEEE Softw., 1991)