I have just finished two weeks of Fast Track sensory groups, working with Sensory Solutions. Four sessions (they are not really 'groups' as such) a day for 2 weeks, with the client team making changes to the products trialled from group to group.  It's basically a large-scale filtering process, where the aim is not to come up with the 'answer' as such, but to have narrowed down product options to something that can be tested in more conventional research.

I love how flexible qualitative techniques are!