Which practice aims to improve the quality and credibility of project deliverables?

The practice of verification and validation is focused on improving the quality and credibility of project deliverables by ensuring that they meet specified requirements and work as intended. Verification involves checking that the products or services meet defined specifications, while validation ensures that they fulfill their intended purpose and satisfy the needs of stakeholders.

By systematically applying verification and validation processes throughout the project lifecycle, organizations can identify defects early on and confirm that deliverables align with customer expectations and requirements. This fosters greater trust in the project outputs, as the quality assurance processes are integral to preventing issues that could arise after delivery.

In contrast, the other practices serve different goals. Supplier agreement management focuses on establishing and managing agreements with suppliers to ensure that their contributions align with project needs but does not directly improve the deliverable quality. Decision analysis and resolution is concerned with making informed decisions based on different alternatives but is not specifically focused on the quality of deliverables. Process management involves overseeing and improving organizational processes, which can lead to better quality in the long term but is not directly aimed at each project's deliverables' immediate quality assurance.

Overall, the emphasis of verification and validation on assessing and ensuring quality makes it the practice that most directly improves the credibility and reliability of project deliverables.