For a Design-Build Schedule to be valid in court, which of the following must be included in the preliminary schedule?

To establish a valid Design-Build Schedule in court, it is essential that the schedule is not just a timeline for project completion, but also includes critical elements that reflect the actual work conditions and constraints. A time scale that incorporates owner-furnished items and planned weather losses is particularly important because it provides a realistic view of the project's timeline.

Owner-furnished items refer to materials or components supplied by the client rather than the contractor. Their inclusion on the schedule is vital because delays related to these items can significantly impact the overall timeline of the project. Similarly, accounting for planned weather losses will give a thorough representation of how weather fluctuations can affect productivity and scheduling. This approach helps in defining a schedule that is more predictable and justifiable, making it defensible in legal settings.

Other options, while potentially useful in project planning, do not directly address the specific requirements for a schedule to be deemed valid in legal circumstances. Summaries of costs, detailed risk assessments, or lists of subcontractors, though important in project management, do not provide the necessary framework that reflects time management related to actual resources and conditions that influence project delivery.