$($a$)$Targets for these are determined based on relevant characteristics related to the addressed topics. Typically, this method is conducted face$-$to$-$face using a prepared set of questions posed to a specified number of target customer groups to achieve a representative sample. Follow$-$up questions occur if noteworthy issues arise. An experienced individual can leverage customer body language to generate questions and gather further information. This method is valuable for acquiring qualitative data.