在与客户谈判合同时，以下因素至关重要：

1. **明确条款：**
- 详细清楚地界定合同条款是首要任务。这包括但不限于产品或服务的描述、数量、价格、交付时间、付款方式、违约责任等。

2. **双方需求：**
- 了解并尊重双方的需求和期望。在谈判过程中，要准确把握客户的核心诉求，同时也要确保自身企业的利益不受损害。

3. **沟通技巧：**
- 良好的沟通能力是成功谈判的关键。这包括有效倾听、清晰表达、适当妥协以及有礼有节的交流。

4. **灵活性：**
- 在不损害基本原则的前提下，保持一定的灵活性。对于一些非核心问题，适度的让步可以促进谈判的顺利进行。

5. **风险管理：**
- 评估潜在风险，并在合同中设立相应的风险控制措施。例如，通过设立违约金、保险条款等来保护双方的权益。

6. **法律合规性：**
- 确保合同内容符合相关法律法规的要求，避免因合同不合法而导致的纠纷。

以下是针对BEC中级考试口语题目的回答建议：

"Negotiating a contract with a customer is a delicate process that requires careful consideration of several key elements. Firstly, it is crucial to have clear and detailed terms spelled out in the contract, including product descriptions, quantities, prices, delivery schedules, payment methods, and liability for breaches. Understanding and addressing the needs and expectations of both parties is also vital. Good communication skills, such as effective listening, clear articulation, and appropriate compromise, play a significant role in successful negotiation. Flexibility, within the bounds of maintaining core principles, can facilitate a smoother negotiation process. Additionally, risk management is important, which involves assessing potential risks and incorporating measures into the contract to mitigate them. Lastly, ensuring legal compliance of the contract with relevant laws and regulations is essential to avoid disputes arising from non-compliance."

希望以上回答对您有所帮助，祝您在BEC中级考试中取得好成绩！