On an agile software project for an oil and gas client, the project manager is having difficulty preparing a schedule because there are many unknowns. Which scheduling method should be used?

Iterative scheduling is ideal for agile projects with many unknowns because it embraces uncertainty. It involves planning in short, repeating cycles (iterations or sprints), allowing the team to adapt and refine the schedule as more information becomes available and requirements evolve. Analogous scheduling uses historical data from similar projects, which is less effective when there are many unknowns. Three-point scheduling (PERT) estimates activity durations using optimistic, pessimistic, and most likely scenarios, but still requires some initial understanding of the tasks, which is limited here. Parametric scheduling uses a mathematical relationship between project characteristics and duration, also requiring known parameters that are absent in this scenario.