California Supplemental (CSE) Practice Exam

Which type of specification typically limits substitutions to a specific product or manufacturer's name?

1. Performance Specification

2. Open Specification

3. Closed Specification

4. Proprietary Specification

The correct answer is: Closed Specification

A specification that limits substitutions to a specific product or manufacturer's name is known as a closed specification. This type of specification clearly defines the exact items that are acceptable for a project, which helps to ensure uniformity and consistency in the materials being used. By restricting options to a particular product or brand, the designer or owner can maintain strict control over quality, performance, and compatibility with other components of the project, reducing variability and potential issues. In comparison, performance specifications focus on the desired results or standards that the materials and products must meet, allowing for various products to be used as long as they achieve the specified performance criteria. Open specifications, on the other hand, invite multiple manufacturers and products to be considered, promoting competition and potentially leading to lower costs. Proprietary specifications are similar to closed specifications, but the term often implies a specific endorsement or preference from a manufacturer, which may include branding or proprietary technologies. However, the core function of a closed specification is its restrictive nature in product selection.