Negotiating with a colleague is nothing like negotiating with a client or a supplier. Here, you have no way out: tomorrow, you will still have to share the same open-plan office, the same weekly meeting, sometimes the same set of targets. The relationship matters more than the transaction. A victory wrenched out today is paid for in coldness, withheld information and silent stonewalling for months on end. The point, then, is not to win, but to secure an agreement the other person will uphold willingly because they recognise themselves in it.
Why an internal negotiation plays out differently
Three particularities change the game. First, repetition: you are playing a game of many rounds, never a single move. Next, the absence of any clear hierarchy between peers: nobody can settle things by authority, everything is resolved through influence. Finally, the emotional dimension: a disagreement over a single slide quickly turns into a matter of recognition, of territory, of ego. The first useful reflex is therefore to separate the person from the problem. You are not against your colleague; the two of you are both facing a decision that has to be made.
Preparing your position before opening the discussion
A poorly prepared internal negotiation degenerates into a clash of opinions. Anchor the discussion in facts. Before the exchange, define your fallback option (BATNA): what will you do if no agreement emerges? Escalate to your manager? Ring-fence your respective remits? Being able to answer that question keeps you calm, and therefore credible. Then arm yourself with objective criteria: real workload, client deadlines, usage data, cost. A shared criterion defuses the ego, because it shifts the debate from «you against me» to «us against the problem».
- Clarify your underlying interest, not just the position you are stating.
- Anticipate the other person's interest: what do they really need?
- Prepare two or three ways to share the load, never a single demand.
The story of Julien and Sarah: two project managers, one developer
Julien is leading the e-commerce site overhaul; Sarah runs the mobile app. Both are claiming the same senior developer at 80% for March. First meeting: each defends their own sprint, and the tone rises. «Your project can wait, mine has a client go-live,» Julien snaps. Sarah shuts down. The meeting ends without a decision, and on a chill that is set to last.
The next day, Julien picks up the conversation differently. Instead of attacking, he uses tactical empathy: «It sounds like you feel your app always comes after e-commerce.» Sarah relaxes and confirms. He follows up with the mirroring technique: «Always after?» She then explains the real stake: an investor demo on 28 March that nobody had told her about.
Everything shifts. Julien pulls out a calibrated question: «How do we manage to hold your demo and my go-live with a single resource?» The constraint becomes shared once again. They rebuild the schedule around objective criteria: Sarah's demo falls on the 28th, Julien's go-live on 4 April. The conclusion is obvious: the developer at 70% on the app until the 28th, then switching to 100% on e-commerce. Julien concedes the first three weeks; in exchange, he gets absolute priority afterwards. A clean give-and-take, where each of them walks away with their deadline met and the relationship intact.
The levers that unlock a disagreement between peers
When tension rises, resist the urge to up the ante. Strategic silence is your best ally: once you have put forward a fair proposal, say nothing. The void pushes the other person to fill it, and often to move. If you are asked for a one-sided concession, never give in for nothing: apply the principle of reciprocity, «I'll agree to push back my task, on condition that you take on support the following week.» Every gesture calls for a gesture. That is how an agreement holds over time.
Within a team, add a collective lever: social proof. «The data team solved the same resource conflict with a rolling schedule» makes a solution acceptable without it seeming imposed. And if a colleague digs in on an unreasonable demand, a measured withdrawal, «Under these conditions, let's take the decision up to the manager,» reframes things without aggression by reminding everyone of the value of reaching a direct agreement.
Locking in the agreement and protecting the relationship
A verbal agreement between colleagues evaporates. Restate it out loud, then send a short written message: who does what, by when, according to which criteria. This is not distrust, it is clarity. Always end on the relationship: thank the other person for having sought a solution with you. In an internal negotiation, the real result is measured as much by the agreement reached as by the desire to work together again tomorrow. To identify the right technique for your situation, explore the library, and to embed these reflexes, practise on the simulator.
FAQ
How do I negotiate with a colleague without coming across as aggressive?
Shift the debate from people to shared objective criteria (workload, deadlines, data) and open with tactical empathy by naming what the other person is feeling. You are no longer attacking a person, you are solving a common problem together. Stay firm on substance, flexible on form.
What should I do if my colleague refuses any compromise?
Go back to your fallback option: know exactly what you will do without an agreement, and you will avoid giving in out of fear. If the deadlock persists, a calm withdrawal, proposing an escalation to the manager, reminds your colleague that coming to terms directly remains in their own interest.
