One of the first reality checks on scheduling that a project manager should make is to review the _____.

The blank in the sentence could be filled with "resource availability" or "project timeline." These terms are crucial for project management, as they allow the manager to assess whether the proposed schedule is realistic and achievable based on the resources (human, financial, technological) and timelines available for the project.

Reviewing resource availability helps ensure that all essential components are accounted for, reducing the risk of delays or over-allocation of resources. Similarly, examining the project timeline allows project managers to identify potential bottlenecks and conflicts early on, enabling them to make necessary adjustments. Both aspects are critical to establishing a reliable and effective project schedule, ensuring that the project can be delivered on time and within budget.

Overall, by conducting this reality check, project managers can enhance the likelihood of project success through proactive planning and resource management.