Parameters of everyday activities in relation to cognitive, social, an
d emotional competence were examined in 2 studies, The parameters incl
uded frequency, difficult importance, intentions for future activities
, changes in past activities, and ability of performance. The challeng
e hypothesis, in which performance of optional activities experienced
as moderately difficult is associated with greatest well-being, was al
so tested. Two samples of older adults completed a life history interv
iew and measures of psychological functioning. Parameters of activitie
s necessary for maintaining an independent engaged lifestyle were meas
ured by the Everyday Activities Questionnaire. In both studies, compet
ence variables helped explain activity parameters independently of age
and demographic variables. There was no support for the challenge hyp
othesis in either study.