A project manager hired a consulting firm for a design study with a strict cost policy, using cost triggers and trend analyses. Which tool is the project manager using?

Earned Value (EV) is the correct answer because it integrates scope, schedule, and cost performance. Cost triggers and trend analyses are key components of EV management, where performance measurement baselines are established, and actual performance is compared against them to identify variances and forecast future performance. This allows the project manager to proactively manage costs and identify potential overruns or underruns. Time and materials (T&M) contracts are a type of contract, not a tool for cost control. S-curve analysis is used for visualizing cumulative cost or work over time, but it doesn't inherently include cost triggers or trend analyses for active cost control in the same way EV does. A control chart is used for monitoring process stability and identifying out-of-control points, not for comprehensive cost performance measurement and trend analysis across an entire project.