The process of gathering the information needed can follow the traditional marketing theory. It is important to define what kind of information a winery would need in order to have a feedback. The field work can be done already during the winery visit or later on (e.g. through facebook site with some motivator like a bottle of wine to win). For the analysis of the information you have (once it exceeds a certain amount) you can have support e.g. from university (students, lecturers, researchers).