The aim of this report is to describe situations where interactive work methods are needed and to suggest suitable participatory methods to enable the use and user involvement in SEAMLESS-IF. Interaction with users and stakeholders are needed for two different purposes. First during different stages of the development of the SEAMLESS-IF itself and second as interaction with users and stakeholders needed as a standard procedure in the situation where an assessment is to be set up within SEAMLESS-IF. The report is organised according to two main perspectives. The first concerns the interaction taking place during the development of the Seamless-IF. The second concerns the interaction taking place when the IF is applied after 2008. Under each of these perspectives prime users and so called other users are considered separately. Participatory methods suitable for the different situations are recommended together with a protocol which gives advice on a step-by-step procedure to follow.