Specifying System Requirements Using the 5S Method. - Robert B. K. Brown; Peter Hyland; Ian C. Piper (ACIS, 2006)

An application of the 5-S activity theoretic requirements method. - Robert B. K. Brown; Peter Hyland; Ian C. Piper (ICSOFT (1), 2006)

5-S: An Activity Theoretic Requirements Elicitation Method for Multi-User Systems. - Robert B. K. Brown; Peter Hyland; Ian C. Piper (Int. Trans. Syst. Sci. Appl., 2006)

What Users Do: SA&D with the ATSA Method. - Robert B. K. Brown; Ian C. Piper (ISD, 2011)

Towards Intelligent Requirements. - Robert B. K. Brown; Angela M. E. Piper; Ian C. Piper (Int. J. Intell. Inf. Technol., 2015)