What types of activities are primarily considered when trying to shorten a project's length?

Choosing the focus on zero float and least cost is crucial when attempting to shorten a project's duration. Zero float refers to activities that are on the critical path which have no flexibility in scheduling; any delay in these tasks directly affects the project's completion date. By identifying these activities and aiming to manage them effectively, project managers can take specific actions to minimize their duration without affecting the overall project timeline.

Additionally, considering least cost involves evaluating ways to shorten the project while also being mindful of maintaining expenses within budgetary constraints. This means finding a balance between speedy completion and financial feasibility, which often leads to strategic decisions about which tasks to prioritize for acceleration.

This approach ensures that project managers focus their efforts on the most impactful aspects of the project that will yield the greatest reduction in total time, thereby effectively shortening the project's length.