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See:
Participatory research with older people: a practical guide (PDF)
www.helpage.org/images/pdfs/Participation.pdf
Practical issues: Participatory research: Participatory learning and action. Participatory learning and action is a research technique that enables people to communicate their experience in a way they feel comfortable with. This technique has been used in northern Iraq to learn about the situation of older Kurdish people.
www.helpage.org/practical/PartResPLA/PartResPLA.php