Which process is essential for ensuring that the project's success is measured against its objectives?

Performance monitoring is critical because it enables the project manager and the team to track and measure progress against the project's established objectives and performance indicators. By systematically collecting data on key metrics, stakeholders can assess whether the project is on track to meet its goals, allowing for proactive adjustments if necessary. This process involves evaluating not only the efficiency of project deliverables but also their effectiveness in achieving desired outcomes.

In contrast, other options focus on different aspects of project management. Quality management ensures that the project's deliverables meet the required standards and specifications but does not directly measure success against objectives. Scope management deals with defining and controlling what is included in the project, helping to avoid scope creep but not primarily focused on performance tracking. Time management focuses on the scheduling of tasks and meeting deadlines, which is important for project execution, yet it does not evaluate whether the project's goals are being met. Performance monitoring is the integrative process that aligns these efforts towards verifying the success of the project against its defined objectives.