Interpersonal skills are crucial for effective communication and interaction with others. They encompass a wide range of abilities, characteristics, and underlying principles that enable individuals to build relationships, understand diverse perspectives, and work collaboratively.

Understanding Interpersonal Skills Components

Let's analyze each option to determine which one is typically considered not a part of interpersonal skills:

• Trust: Building and maintaining trust is a fundamental aspect of strong interpersonal relationships. The ability to foster trust involves skills like honesty, reliability, and empathy. Without trust, effective communication and collaboration become very difficult. Therefore, trust is an integral part of interpersonal dynamics and is directly influenced by interpersonal skills.
• Expectations: Understanding, communicating, and managing expectations are vital interpersonal skills. This includes being clear about one's own expectations, recognizing the expectations of others, and negotiating where necessary. Effective management of expectations prevents misunderstandings and conflicts, making it a core part of interpersonal interactions.
• Values: Recognizing, respecting, and navigating different personal and organizational values is essential for effective interpersonal relations. Interpersonal skills help individuals appreciate diverse values and find common ground or respectful ways to interact despite differences. Shared values can strengthen relationships, while differing values require skillful navigation. Thus, values are a significant underlying part that interpersonal skills address.
• Rigidity: Rigidity refers to an unwillingness or inability to change, adapt, or compromise. This characteristic is directly antithetical to effective interpersonal skills, which often require flexibility, open-mindedness, and adaptability to different situations and personalities. Someone who is rigid will likely struggle with communication, conflict resolution, and relationship building. Therefore, rigidity is definitively not a part of effective interpersonal skills; rather, it is a hindrance to them.
• Feedback: Feedback, both giving and receiving, is a specific and critical communication process within the realm of interpersonal skills. It involves providing information about performance or behavior, or actively listening to such information from others. While feedback is an incredibly important tool and practice within interpersonal communication, the question asks what is not a part of interpersonal skills. In some contexts, feedback can be seen as a specific communicative action or tool that is employed, rather than a fundamental underlying component or characteristic of interpersonal skills themselves, in the same way that trust (a state), expectations (concepts to manage), or values (guiding principles) might be considered broader foundational elements. While giving/receiving feedback requires specific interpersonal skills, "Feedback" itself, as a concept or process, can sometimes be viewed as an application of skills, rather than an inherent part of the skills' foundational make-up.

Identifying the Non-Interpersonal Skill Component

Considering the options, while trust, expectations, and values are foundational elements that interpersonal skills help to navigate and build upon, and rigidity is clearly an opposing trait, "Feedback" stands out as a specific communicative process or tool. It's an action performed within interpersonal interactions rather than an underlying quality or foundational concept in the same way as the others.

Based on the common interpretation, all listed options (except possibly rigidity, which is an anti-skill) are related to interpersonal skills. However, if we must select one that is not a part in a fundamental conceptual sense compared to the others:

Given the options, and interpreting "not a part" strictly in the context of foundational elements or inherent characteristics, "Feedback" can be argued as a specific communicative act or tool employed through interpersonal skills, rather than a foundational "part" of the skills themselves in the same conceptual category as trust, expectations, or values. Although crucial, it's a method rather than an underlying concept or trait.

The final answer is Feedback.