Participants in this group will have up to 10 personal meetings with activities counselors and several group meetings.

Participants in this group will not have meetings with the activities counselors, and will not take part in the group meetings.

The I-SOCIAL intervention is based on findings from Cohen-Mansfield and Parpura-Gill (2007), which highlighted the important role of barriers in contributing to loneliness in older persons. These barriers include a perceived lack of opportunities for social contacts, low social self-efficacy, and health and mobility difficulties. The intervention includes: (1) identifying the barriers for the specific person; (2) up to 10 meetings with an activities counselor. The meetings include discussions concerning options for social contacts and use of techniques and resources to tackle the barriers; and (3) group meetings of participants and the activities counselors in order to provide a concrete social event and as a venue to discuss barriers and ways to address them.

Loneliness will be assessed via several measures: (a) Frequency of loneliness will be measured via one item ("How often would you say you feel lonely?"; (Mullins, Woodland, & Putnam, 1990) on a 6-point scale from "never" (1) to "several times an hour" (6); (b) The UCLA Loneliness Scale- 8 items (ULS-8; (Hays & DiMatteo, 1987). Each item is rated on a 5-point scale from "not at all" (1) to "to a great extent" (5), with a higher score indicating more loneliness. Based on experience from another study (Cohen-Mansfield et al., 2013) one item ("I am unhappy being so withdrawn") was replaced with two items ("I feel physically distant from other people"; "I feel emotionally distant from other people).