Drawing on three case studies in the Catalan Pyrenees (Spain), this paper shows how interactions between planners and stakeholders influence expectations, uncertainties and conflicts during the planning process. Therewith, it provides further understanding of performance of regional planning beyond the formality of plans and policies. The case studies illustrate how planners' actions can either generate uncertainty, conflicts and frustration, or common understanding, agreements and positive expectations. With these insights, planners can be more conscious about the effects of their communicative strategies on the multiple perceptions of the planning process. Planners need to deal with interpretations of other actors, and they have to be aware of others' expectations and uncertainties. The positive effect of interactions has limitations because of the unavoidable existence of different perceptions and interests concerning a plan. Nevertheless, planners can generate even greater conflicts themselves if the perceptions from other stakeholders are ignored.