In some markets, suppliers experience peaks and troughs in demand and so buyers can increase their leverage through developing an understanding of how busy their vendor are at particular time during the year or business cycle and targetting atquieter period. Similarly, if a buyer can develop an understanding of supplier capacity and to what extent have they covered their fixed cost, they may be able to target suppliers when their average costs are likely to be lowest. Vendor's average costs will be higher at low and high capacity utilisation.
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Distributive approach to negotiation used when the interested parties are attempting to divide something up or distribute something of value, also known as zero-sum approach or win-lose. Win-lose approach is useful when the relationship with the other party (TOP) is short-term and once-off.
The question mentions 4 types of relationship:
Adversarial: Both seek to maximize position at the expense of the other. Almost no trust, communication and cooperation. These suppliers will probably provide non-core products or services with the buyer purchasing them on a one-off basis.
Outsourcing relationship: Use competent suppliers to manage non-core businesses previously done in-house.
Require high level of trust and collaboration
Partnership: Both work closely on long term development by sharing information, technology and ideas.High level of trust with the aim to benefit both parties (win-win) Strategic alliance: Both parties identify areas where they could collaborate to create mutual benefits Among these 4 types ofrelationship, only adversarial is once-off. Then it is the correct answer.

Explanation
Reflecting on performance should become a natural final step in the negotiation process.
'Celebrating publicly about the deal': Public gloating, even in success or failure, if it gets back to the supplier via the press or social media, will likely damage the relationship
'Tempting TOP to reopen the negotiation': whether TOP agrees to reopen the negotiation, procurement should reflect on their achievement and what can be improved.
'Asking TOP for another concession': TOP can agree or rejectthis concession. Eventually, reflecting should be the final step. Procurement can learn a lot from reflection on performance.
LO 3, AC 3.4

Explanation
Principled negotiation is based on four fundamentals: people, interest, options andcriteria:

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1st Principle: separate the people from the problem: Negotiator should depersonalise the situation and accepting that the subject matter of the negotiation. This can be difficult for untrained negotiators, but this is a key skill to develop
2ndprinciple: focus on interests, not positions: It is important in principled negotiations not to focus on their parties' positions (what are expressed during negotiations), but on the interests (underlying needs) behind them
3rd principle: invent options for mutual gains: this principle aims to help the parties find a solution that both would benefit from. The more options - or tradeables - that can be brought to the table the better.
4th principle: insist on using objective criteria: is about making sure that the negotiation stays focused on outcomes based on objective criteria and that it is productive.
LO 1, AC 1.2

MIL criteria indicate 3 limits that negotiator should establish:
M - Must achieve: minimum target/maximum you can concede on this point; the mandatory requirement or fall back position I - Intend to achieve: realistic target you are aiming for on this point L - Like to achieve: stretch target to achieve on this point.
PPCA is purchase cost analysis
TIMWOOD indicates 7 types of waste in Lean principles
The RAQSCI model is a mnemonic summary of a business model used to define and structure business requirements