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I'm currently working in a new interactive museum in Mexico City, we just started the process of evaluate some exhibits in the design and production phase (formative). I'm having problems to explain why this kind of evaluation does not need large statistical samples, great part of the team thinks that we need to have representatives samples and, I read in some classical texts (Screven, Griggs, Hein) that this is not necessary nor practical.

Does any one have a good methodological frame to pick good samples for this kind of evaluation? Or does any one could recommend me the "Formative evaluation handbook"? I prefer things I can consult through web because in Mexico is difficult to get those books, although we can buy some basic and interesting texts.

Thanks in advance

Leticia Pérez Castellanos
Research and Evalaution Area
Espacio Cultural y Educativo Betlemitas

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