What aspect does project cost control focus on?

Project cost control primarily focuses on measuring actual performance against plans. This involves comparing the ongoing financial performance of a project to the initially established budget and schedule. By doing so, project managers can identify variances between the projected budget and actual expenditures. This assessment allows for the implementation of corrective actions to address any discrepancies and ensure that the project remains aligned with financial goals.

Additionally, measuring actual performance involves tracking various cost metrics and key performance indicators, which help in understanding how efficiently resources are being utilized throughout the project lifecycle. By continuously monitoring these aspects, project managers can make informed decisions, adjust budgets, and manage resources effectively to keep the project on track.

The other options, while related to project costs, do not directly address the specific focus of project cost control. For example, estimating future costs pertains to budgeting and forecasting, calculating tax costs is more about financial implications rather than direct project management, and summing up repair and service costs does not encompass the broader monitoring and control objectives that project cost control aims to achieve.