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Creativity is often needed in requirements elicitation, ie, generating ideas for requirements, and techniques to enhance creativity are believed to be useful. How does the size of a group using POEPMcreate, an optimization of EPMcreate, affect the group’s and each member of the group’s effectiveness in generating requirement ideas? This paper describes an experiment in which groups of sizes one and two 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 groups of sizes two and four indicate that the size of a group using POEPMcreate does affect the number of raw and new requirement ideas generated by the group and by each member of the group. The conclusion from the data is that the larger a group is the more raw and new requirement ideas it generates. However, there is some support for the conclusion that a group member generates more raw and new requirement ideas in a smaller group than in a larger group. This conclusion is supported by qualitative data gathered from a survey of professional business or requirements analysts.