Make the third alternative tangible with a prototype or model

Turn an abstract third-alternative idea into something both parties can react to together.

Why it works

Abstract agreement on criteria often dissolves when a concrete proposal appears, because each side imagines different things. A rough prototype — a diagram, a written scenario, a role-play — forces shared reality. Reactions to the model surface assumptions that were invisible in the abstract conversation, allowing them to be addressed before commitment.

How to do it

1. Once a candidate solution emerges, make it concrete: write it as a one-paragraph scenario, draw it, or role-play it.
2. Ask both parties to react specifically to the model, not to the general idea.
3. Treat reactions as refinement data, not rejection — update the model and check again.
4. Declare the solution adopted only after both parties have reacted to the same concrete version.

Evidence

Prototyping as a reality-testing tool is well established in design thinking and conflict mediation. Making proposals tangible reduces the ambiguity that allows each party to over-optimistically assume the deal means what they want. (mechanistic)

Evidence base is design and mediation practice literature; controlled outcome research comparing prototyping to abstract agreement in conflict resolution is sparse.

Common mistake

Announcing "we have a third alternative" after verbal agreement, then discovering each party imagined a different implementation — prototyping prevents this before commitment locks both sides in.