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The diversity of special user groups, i.e. elderly from 50 to 90 years and children from 6 to 14 years, is huge. Assessing their requirements is challenging, as it requires sensitivity in terms of choosing an appropriate approach to collect data. Furthermore, the illustration of the data for the subsequent design process can be difficult, if different partners are involved in a project. In order to overcome these difficulties, we are exploring a decision diagram for the creation of personas. It aims at identifying the most appropriate approach (i.e. qualitative and/or quantitative data collection), taking into account the characteristics of the special user groups among other aspects. In this case study we present how we applied the decision diagram in three different projects to create personas for elderly and children.