Estimating Project Performance through a System Dynamics Learning Model. - Thomas Walworth; Mike Yearworth; Laura Shrieves; Hillary Sillitto (Syst. Eng., 2016)

What is a System? An Ontological Framework. - Dov Dori; Hillary Sillitto (Syst. Eng., 2017)

System Definition, System Worldviews, and Systemness Characteristics. - Dov Dori; Hillary Sillitto; Regina M. Griego; Dorothy McKinney; Eileen P. Arnold; Patrick Godfrey; James Martin; Scott Jackson; Daniel Krob (IEEE Syst. J., 2020)