Which aspect is critical to improving estimating accuracy in complex projects?

Conducting thorough risk assessments is critical to improving estimating accuracy in complex projects. Risk assessments allow estimators to identify potential issues that may impact the project's cost, schedule, and scope. By evaluating various uncertainties and their probabilities, estimators can better anticipate challenges and include appropriate contingencies in their estimates. This proactive approach leads to more reliable estimates, as it incorporates a comprehensive understanding of potential risks and their effects on the project.

In contrast, relying solely on previous methods doesn't account for the unique complexities of each new project, which may involve different variables and risks. Reducing the number of estimates can limit the diversity of approaches and solutions considered, potentially leading to oversimplification of the project’s needs. Excluding client input can also negatively affect the accuracy of estimates, as clients often provide valuable insights into project requirements and constraints that need to be factored into the estimate. Comprehensive risk assessments, therefore, stand out as a fundamental component of effective estimating in complex project environments.