Two friends explore a product/concept together and discuss about it (with or without a moderator). Videorecording is used especially when no moderator is present.
Two participants (typically friends who know each other) explore the product together, freely discussing about it. Video is recorded and/or a moderator is present to guide the discussion. Sharing experience with a friend triggers typically more experiential comments than when discussing with a moderator.
May trigger more authentic experiential data than a normal face-to-face interview. The discussion might reveal interesting experiential aspects. Most suitable for investigating the initial responses to products.
Hard to control the direction of the discussion.
Jordan, P. (2003) Designing Pleasurable Products
References describing the method