Knowledge about number of amateurs in top-class sports, their background and problems coinciding with practising sport.R's parents active in sports / r practising particular sport/ is this sport much practised in the area by different groups of people / is r practising top-class sports / r involved in centralized training/ competing in international competition/ problems involved in stay at international competitions / r's opinion about criteria for selection for international competition and Olympic Games / r's training program per week/ time schedule / satisfaction with training facilities / detailed information asked about several costs/ paid by whom / medical checkup, information on nutrition, vitamins / being a student having more facilities / in working: satisfaction with possibilities in profession to practice topsport / r stimulated in practising sports / behaviour of the media / sponsoring, commercials, rewards etc. / agree, disagree with number of statements on top-class sports.Background variables: basic characteristics/ occupation/employment/ income/capital assets/ education/ politics/ religion