Evaluation-study of effects of participation in the development of a regional plan for Midden-Gelderland. P0613a: reasons ( non )participation in 2nd phase information / organization / evaluation first round / personal circumstances / interest and evaluation 2nd phase / evaluation first phase / opinions on participation in general / experiences with participation / opinion on functioning of provincial authorities. P0613b + c: actual participation in 2nd phase and reasons / information in advance / information meetings / functioning of discussion groups / choice from provincial government / provincial government and feedback / general evaluation of organization and effects / participation in first phase / opinions on participation in general / former experience with participation. Background variables: basic characteristics/ residence/ place of work/ occupation/employment/ education/ politics