What is one of the two main works that product documents consist of?

The correct choice encompasses one of the key components of product documents used in construction projects. The Project Manual serves as a critical collection of documents that provides essential information about the project. It typically includes bidding requirements, contract forms, and conditions of the contract, alongside the specifications.

To understand its significance, the Project Manual acts as a guide for contractors and stakeholders, offering clarity on the terms and conditions governing the project. It sets the framework for how the work will be executed and delivered, which is why it's one of the two main works in product documentation.

Other options may include important project documentation as well but do not fulfill the same comprehensive role as the Project Manual. While specifications detail the required materials and quality, contract templates provide a structure for legal agreements, and the schedule of values outlines the cost breakdown of project work, none of these serve the multifaceted purpose that the Project Manual does in the construction documentation process.