Innovation Jam

A method that involves both internal employees and external customers (depending on setup). The method itself comes from IBM who have used it with great success. During their first session IBM got over 46 000 new ideas for new services, products and process improvements.

Additional reading
Bjelland, Osvald M., and Robert Chapman Wood. “An Inside View of IBM’s’ Innovation Jam’.” MIT Sloan management review 50.1 (2008): 32-40.