Here is a good article about Plan A and B.
http://www.marriagebuilders.com/graphic/mbi8113_ab.htmlHarley does recommend moving to Plan B when the WS persists in continuing destructive behavior - HOWEVER, it is important that Plan A be used for a while beforehand:
While I have seen remarkable success by people using plan A and plan B, success is by no means guaranteed. The problem with Plan B is that the unfaithful spouse may not return, nor agree to the plan for recovery, even after the affair has ended. Separation in marriage is always risky because, "out of sight, out of mind." Unless plan A leaves the wayward s pouse with the impression that returning home is an attractive choice, separation can become permanent. So before implementing plan B, you want to be sure that the last thing your spouse remembers about you is the care and thoughtfulness you offered in plan A. That way, the separation can help create, "absence makes the heart grow fonder."
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In general, I recommend separation when at least one spouse cannot control destructive behavior. An ongoing affair, of course, is one of those situations. Hence, plan B. But other situations such as physical and verbal abuse, where one spouse's mental or physical safety is as risk, are also grounds for separation. As in the case of infidelity, if one spouse is abusive, I often recommend plan A first, where, through negotiation (without anger, disrespect or demands), an attempt is made to overcome the abuse without separating.
But in some cases, the safety risks are so great that plan B should be implemented immediately, with no time for plan A. In these cases, treatment for the abusive habit must take place during separation, and some evidence must exist that the risk has been greatly reduced, or completely eliminated, before the spouses should return to each other. Then, after being together again, the formerly abusive spouse should be held accountable by others for his or her behavior to assure the other spouse's safety.
In other cases, such as annoying behavior or failure to meet important emotional needs, where thoughtlessness does not reach the level of physical or mental abuse, plan A should be given quite a bit of time and effort before resorting to plan B.
<small>[ January 21, 2003, 10:09 AM: Message edited by: MelodyLane ]</small>