This Association provides a social network which helps single and married Catholic lay men live out their various vocations as colleague, husband, father, friend, committed Christian and active Catholic. Help is offered to members and their families through both practical and spiritual support: by steadfast friendship in times of trouble, by offering financial help when needed, and through prayer. This support continues with ongoing concern for a deceased member's widow and dependants. The Association is based on deep and lasting friendships, developed by members meeting monthly and afterwards sharing a meal or other refreshments, and by providing a varied social programme in which wives and families are fully involved. These friendships are uniquely built upon the firm foundation of a shared faith.

Membership is open to practising Catholics aged 21 and over. Both the benefits and commitments of membership are fully explained before a formal membership application is made. Invitations are extended to prospective members to attend a number of Circle meetings and social events, with wives and families where appropriate. Then formal application to the local Circle may be made if desired. There are no limitations based on occupation, income or race. Wives of members are not required to be Catholic; many are not and enjoy Catenian life to the full.