Opinion of citizens of Amsterdam on housing problem, squatting and squatters/ opinion of squatters on housing problem and squatting. Squat, when do squatters have to leave / cause of squatting / action of government, police against squatters / more or less sympathy for squatters during last years / news about squatting from which source / opinion on this source / political voting behaviour. Background variables: basic characteristics/ household characteristics/ politics/ consumption of durables/ readership, mass media, and 'cultural' exposure