The schedule estimates for a particular work package that is underway were not properly considered and the timescales are too tight. Which of the following methods should the project manager select to

PDM (Precedence Diagramming Method) is a technique for scheduling activity relationships during project planning, not for investigating performance issues on an underway work package.

Schedule Performance Index (SPI) and Schedule Variance (SV) are key Earned Value Management (EVM) metrics used to assess project schedule performance against the baseline, indicating efficiency and whether the project is ahead or behind schedule, which directly helps in investigating tight timescales.

CPM (Critical Path Method) is used to determine the longest path and shortest project duration during planning and monitoring, but not specifically for investigating why initial estimates were too tight on an underway work package.

An issues log records specific problems that require resolution, but SPI and SV are diagnostic tools to quantify and investigate underlying schedule performance issues systematically.