Introducing requirements engineering appears to involve a cultural change in organizations. Such a cultural change requires that requirements are defined and managed systematically, not only from a technical point of view, but also from the customers? and users? points of view. This paper describes experiences gained from four Finnish organizations that have started to introduce requirements engineering to their product development. The goal of this study was to evaluate which factors support, and which prevent, a cultural change. Linking business goals to technical requirements via user needs and user requirements was one of the key improvement actions that supported cultural change. Eliciting needs directly from real users and representing user requirements in the form of use cases were also key activities. However, bringing about a change of culture was challenging because both managers and product development engineers held beliefs that prevented active user need elicitation and systematic user requirement documentation.