Comparison of the effects of three research methods: paper and pencil interview (PAPI), computer assisted telephone interview (CATI) and computer assisted self interview (CASI). Time budget surveys with coded activities / work / domestic activities / child care / goods and services (shopping etc.) / personnel needs / education / organizations / entertainment / active and passive leisure / travel / comparison with respect to response / validity / costs / precision / nr. of mistakes / reliability. Background variables: basic characteristics/ place of birth/ household characteristics/ occupation/employment/ income/capital assets/ education/ religion