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Creativity is often needed in requirements elicitation, ie, generating ideas for requirements, and therefore, techniques to enhance creativity are believed to be useful. How does the size of a group using the EPMcreate creativity enhancement technique or an optimization of it, POEPM-create, affect the group’s and each member of the group’s effectiveness in generating requirement ideas? This paper describes an experiment in which individuals and two-person and four-person groups used POEPMcreate to generate ideas for requirements for enhancing a high school’s public Web site. The data of this experiment combined with the data of two previous experiments involving two-person and four-person groups using EPMcreate and POEPMcreate indicate that the size of a group using EPMcreate or POEPMcreate does affect the number of raw and new requirement ideas generated by the group and by the average member of the group. A conclusion from the data is that generally, the larger a group is, up to a particular group size that depends on the creativity enhancement technique used, the more raw and new requirement ideas it generates. After that particular group size, the larger a group is, the fewer raw and new requirement ideas it generates. Another conclusion from the data is that generally, the larger a group is, up to a particular group size that depends on the creativity enhancement technique used, the more raw and new requirement ideas the average group member generates. After that particular group size, the larger a group is, the fewer raw and new requirement ideas he or she …