This paper presents thoughts on different aspects to take in consideration when studying the spin-off phenomena and presents a recommendation to classify the originating firm with accordance to; Type, Size, Role played, Attitude, Knowledge and Situation and classify the spin-off firm with accordance to; Relationship of operations, Driving force, Contribution from earlier employment and Number of founders and for the founder/s, Education and personal motives together with other data that is relevant for the specific research project.