An adversarial relationship in purchasing and supply arises when identical or equivalent good or services are available from competing suppliers and buyers/sellers are trying to gain an advantage over each other. Low levels of trust are characteristic of adversarial relationships. The outcome when two organisations with adversarial negotiate is most likely to be win-lose.

Bargaining is the negotiation stage where tradeables are typically introduced and discussed. During this phase, both parties exchange offers and concessions, using tradeables such as lead times and order quantities to find a mutually acceptable agreement. This aligns with CIPS ' s guidance on the stages of negotiation.

Post-negotiation analysis should include performance evaluation, learning outcomes, and a comparison of achieved results versus original objectives. These elements contribute to continuous improvement and future strategy development.

Adversarial relationships typically lead to distributive (win–lose) negotiations, where each party seeks maximum gain at the other’s expense. Trust is low, information is withheld, and concessions are hard-fought. While it can deliver short-term wins, it risks damaging long-term relationships and may reduce overall value. Collaborative, integrative approaches are more sustainable, but adversarial conditions often prevent them. CIPS highlights the importance of recognising relationship dynamics before selecting negotiation style, as forcing integrative approaches in adversarial contexts may be unrealistic.

Integrative negotiation requires shared motivation to collaborate and focus on joint benefits. When parties are motivated to work together, they can share data, explore tradeables, and align on long-term value creation. Conversely, lack of trust, unwillingness to share, or absence of joint goals make integrative approaches unworkable, forcing adversarial or distributive methods instead. CIPS highlights that motivation and willingness to cooperate are preconditions for collaboration.

A probing question seeks deeper information, clarifying specifics beyond surface-level responses. Lina’s question is factual, detailed, and investigative — designed to uncover processes and commitments. Hypothetical questions test options (“what if…”), reflective restate or summarise to confirm understanding, and leading steer the respondent toward a desired answer. Probing is essential in negotiations to validate claims, identify risks, and build persuasive arguments.

CIPS describes a relationship spectrum from arm’s-length/transactional through collaborative/partnership, matched to spend criticality, risk, and strategic importance; analysis helps select the appropriate relationship style before and during negotiation.

Integrative negotiation emphasises maximising joint outcomes and pursuing shared goals, moving beyond narrow self-interest. Unlike distributive negotiations, it does not focus on short-term wins or zero-sum positions. Instead, integrative strategies build sustainable value and strengthen partnerships. Maximising the other party’s outcome alone is more accommodative than integrative. Therefore, true integrative practice balances both parties’ interests for long-term gain.

With a collaborative supplier, the appropriate approach is Win–Win (integrative). Both sides aim to create savings while maintaining partnership value. Win–Lose would damage collaboration, while Lose–Lose sacrifices value on both sides. Win–Perceived Win is based on optics rather than actual balance. By adopting a win–win approach, Maria ensures sustainable cost reductions while protecting critical NHS supplier relationships.

Trust is the expectation that the other party will behave in a predictable and mutually acceptable way. In inter-firm relationships, the presence and absence of trust can affect the level of cost in a relationship. The existence of trust is taught to lower the transaction cost in a relationship. Dr. Mari Sako identified taxonomy of 3 types of trust in commercial relationship, which is very useful from the perspective of procurement.

Contractual trust: Trust based on the contract with TOP. This is potentially the weakest source of trust if there is nothing else to base the trust on, but it is the quickest to establish.

Competence trust: Trust based on TOP ' s professional qualifications or proven or certified technical capability or experience.

Goodwill trust: Trust based on knowing TOP has your interest at heart and will not behave opportunistically. This is potentially the strongest type of trust, but it takes the longest time to build.

Otherwise, trust also has legal meaning. A trust is a legal document that can be created during a person ' s lifetime and survive the person ' s death. A trust can also be created by a will and formed after death. Charitable trusts are trusts which benefit a particular charity or the public in general.