Justin Jansen, professor Entrepreneurship at the Rotterdam School of Management, has been mentioned in an article. The article discusses the research of RSM that the increase in the number of fast-growing companies has halved in the past year. Fewer start-ups are becoming a fast-growing company. A fast-growing company, also known as a scale-up, is a company with 10 or more full-time employes that in a period of three years the average frowth is at least twenty percent per year.