“…The so far most frequently used instrument is a selfreport questionnaire (SOC questionnaire, Freund & Baltes, 2002b). Other indicators have been derived, for example, from minuteto-minute reconstructions of the sequence, duration, geographical, and social context of everyday activities (Baltes & Lang, 1997;Lang, Rieckmann, & Baltes, 2002), from content analyses of strategies employed to cope with disability (Bouchard Ryan et al, 2003;Gignac, Cott, & Badley, 2000, or from patterns of self-reported resource investment in various domains of life (e.g., Staudinger & Freund, 1998;Staudinger et al, 1999;Wiese, 2000;Wiese & Freund, 2000).…”