The group needs to be closed to encourage safety, deepen intimacy, and provide confidentiality. However, a group will quickly dissolve if there is not a graceful way to exit the group and for new couples to join. Also, sometimes a closed group can engender mistrust or even envy within a larger fellowship.
One way to manage this balance between being closed and being open is for each couple to commit to being in the group for a defined period, e.g. 6 months. After 6 months, each couple can say whether they are able and wish to commit to a further 6 months. If a couple drops out, the group can then decide whether it is ready to invite a new couple into the group.
New members of the group would be expected to have also completed a couple enrichment event and understand the basics of the witnessed Couple Dialogue process. The initial group might know of such people and extend a personal invitation, or might simply make an announcement in their community that interested couples should contact them. A way to ensure having couples interested in joining an ongoing group is to periodically host a couple enrichment workshop. Just contact Friends Couple Enrichment at email@example.com and we will find a leader couple to facilitate an event.