A ctivity participation is an important aspect of well-being in older adulthood (Klumb & Maier, 2007; Menec, 2003; Rowe & Kahn, 1997). In measuring activity, past studies have typically relied on self-ratings of how much (frequency or amount of time) the respondent participates in selected activities. The activities can be specific, such as watching television or walking (Kronenberg et al., 2000; Perkins & Clark, 2001), or can reflect more general categories, such as social or religious activity (Glass, de Leon, Marottoli, & Berkman, 1999; Lawler-Row & Elliott, 2009). Illustrating the usefulness of this approach, frequency of participation in social, leisure, and productive activities has been linked to health and well-being in older adults on a consistent basis (Adams, Leibbrandt, & Moon, 2011). Other activities, such as passive entertainment or taking care of family members, are commonly less strongly associated with positive outcomes (e.g., Katz & Yelin, 2001). In this literature, the extent of participation in specific activity types is commonly totaled to obtain an index of overall activity level, as seen in the Yesterday-Interviews (Klumb & Baltes, 1999). However, activity frequency ratings have several limitations. First, the same type of activity can have a varying meaning or function for different individuals (Bonder & Martin, 2000; Everard, 1999).