Karine Pellen is a system engineer working on complex collaborative systems in Thales. In her job, she tries to get users needs and formalize them into consistant system engineering data. She has been practicing Model Based System Engineering, in real life, on many different projects for more than 10 years. She uses Arcadia engineering approach, supported by Capella, strongly linked to other engineering data. With other convinced people, they coach people and help them change their engineering practices into more collaborative and formal ones.