A useful and simple shorthand for preferred negotiation styles is summarised by four simple descriptor:
'warm', 'tough', 'logical' and 'dealer', which can be applied to describe individuals' dominant preferred style in most circumstances.
Warm - a people person
Tough - a hard-nosed negotiator
Logic - a numbers person
Dealer - a trader who loves bargaining
Strengths, weaknesses of logical style are described below:
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A win-win (integrative) negotiation focuses on shared interests and joint value creation. The first step is identifying where both parties' interests align, followed by designing creative options that allow both sides to gain more of what they need. Limiting resources and imposing subjective standards are characteristics of distributive or adversarial approaches and restrict value creation. CIPS clearly distinguishes integrative negotiation as collaborative, interest-based, and solution-focused, particularly suitable for long-term and strategic supplier relationships.
Reference: CIPS L4M5 Commercial Negotiation (CORE), 2nd edition - LO 1.1: Stages and principles of integrative (win-win) negotiation.

Integrative (win-win) negotiation looks for value-equivalent tradeables across the bargaining mix (price, service, warranty, aftercare, etc.). If the same total saving is achieved via aftercare-and the buyer needs it- accepting the tradeable meets objectives without forcing a distributive fight on unit price.
Reference: CIPS L4M5 (2nd ed.), LO 1.1 - Distributive vs integrative approaches; use of tradeables in the bargaining mix.

Using logic involves applying numerical data and factual evidence to support arguments in a negotiation.
Logical reasoning appeals to objective analysis rather than emotional or coercive tactics and is effective in convincing the other party through structured, fact-based arguments, aligning with CIPS's guidance on logical negotiation techniques.

In 1959, French and Raven described five bases of power:
1. Legitimate - This comes from the belief that a person has the formal right to make demands, and to expect others to be compliant and obedient.
2. Reward - This results from one person's ability to compensate another for compliance.
3. Expert - This is based on a person's high levels of skill and knowledge.
4. Referent - This is the result of a person's perceived attractiveness, worthiness and right to others' respect.
5. Coercive - This comes from the belief that a person can punish others for noncompliance.
Six years later, Raven added an extra power base:
6. Informational - This results from a person's ability to control the information that others need to accomplish something.
In the scenario, Neville attracts and keeps good relationship with his colleagues not because of neither position nor reward nor coercion. He has good skills and kindness, which increase his charisma. His source of power is referent power.
Reference:
CIPS study guide page 47-50
French and Raven's Five Forms of Power