Design criteria is a term used to describe the standards and requirements that must be met when designing a product or service. It is often used in the engineering and construction industries, as well as in software development. The term SPEC is an acronym for 'specifications, ' which are detailed descriptions of the design criteria that must be met. SPECS is an acronym for 'specifications and standards, ' which are more detailed descriptions of the design criteria that must be met. Both terms are used to ensure that the product or service meets the desired quality and performance standards.