Convergence involves integration, and one of the most plain expressions of this is how (for married couples) wives and husbands flow together. Married life can be greatly enhanced, if not simplified, if there is an agreed joint decision-making framework. Failure to agree on this basic life-process can lead to conflict, misunderstanding and divergence.
Practically, each person should map out how they, in their minds, make decisions. Then compare notes, and agree on a shared decision map. Test it out on a small decision or two before graduating to larger decisions.