Moonshine is the practice of workplace innovation in which the end user plays a prominent role. The KLM Engineering & Maintenance moonshine program uses a prescriptive moonshine process model. This paper describes the development of a moonshine pro cess model from practitioners' literature. The model is tested in twenty-three cases of employee involved workplace innovation at KLM Engineering & Maintenance. We found additional activities used in practice, and found activities depicted in the model but not used in the cases. The iterative and recursive nature of moonshine was observed. Variables affecting moonshine were found in the case study, which are used for constructing a research question for future research into moonshine.