This is an extremely useful method of data collection that provides complete freedom in terms of content and structure. As a researcher you are free to order these in whatever sequence you wish, keeping in mind the context. You also have complete freedom in terms of what questions you ask of your respondents, the wording you use and the way you explain them to your respondents. You usually formulate questions and raise issues on the spur of the moment, depending upon what occurs to you in the context of the discussion.