Depending on the scale of the disagreement, some preparation may be appropriate for conducting a successful negotiation.
For small disagreements, excessive preparation can be counter-productive because it takes time that is better used elsewhere. It can also be seen as manipulative because, just as it strengthens your position, it can weaken the other person's.
However, if you need to resolve a major disagreement, then make sure you prepare thoroughly. Using our free worksheet, think through the following points before you start negotiating: