An adversarial style is appropriate when issues are non-negotiable, such as health and safety commitments (D). In these scenarios, compliance is required without compromise, and a firm stance may be necessary. This aligns with CIPS guidance, where adversarial tactics are used in non-negotiable contexts to enforce strict standards.

There are many tactics and ploys that can be used to persuade others, particularly those not trained in negotiation. But in generalthese tactics should be used with care, as they can backfire; and in situations where a long-term relationship is desired, they can be, if detected, become an irritant to TOP.
Tactics are particularly effective if and when you are dealing with untrained negotiators, in consumer's buying situation and in once-off encounter.

There are four types of questions that can be used in a commercial negotiation:
Hypothetical questions, where you ask about a possible situation or abstract concept, are very useful at the testing and proposal phases. Hypothetical question does not state any commitment as it is only about 'if something happens, then ...'. This type of question can be useful at giving suggestion.
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LO 3, AC 3.3

In 1983, Peter Kraljic devised a means to segment the supplier base in the article in HBR. In this, he argued that supply items should be mapped against two key dimensions: risk and profitability.
Risk relates to the likelihood for an unexpected event in the supply chains to disrupt operations. For instance, in important areas of spend, such as tire suppliers for an automotive are business critical, and should a disruption occur, the auto company is likely itself to face substantial problems.
Profitability describes the impact of a supply item upon the bottom line. For certain areas of spend, such as stationery, supplies have only a negligible effect on profits. In other categories, a single source of supply can make or break a business.
Putting these two dimensions together yields a classic two-by-two matrix.
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Source: Peter Kraljic, HBR