What is a mixed specification?

A mixed specification refers to a combination of performance-based and design-based specifications. This approach allows for flexibility in how a project is executed. Performance-based specifications focus on the desired outcomes and how the project should perform, while design-based specifications detail the design and specific requirements that must be met. By mixing these two types of specifications, a project can benefit from the clarity and precision of design specifications while also allowing for innovation and efficiency that can be achieved through performance-based criteria. This balance can lead to optimized results as contractors can utilize their expertise to meet performance targets while adhering to important design criteria.