Initial success can give us the false impression that we have chosen the right path. However, sustainable success means that the approach must also work in the longer term, on a larger scale and/or in different circumstances. We see that the step of a Proof of Concept to a Proof of Business is large and often even too large for many companies. The well-known proverb: "You shouldn't sell the hide before the bear is shot." provides a nice metaphor for this situation.