Certainity about outcome for clientNo room for innovaton or improvement by construction/design partiesPrescriptive speci\x15cationsBased on earlier experiences,other projects, conventionsPerformance speci\x15cationsPotential for innovative, new solutionsIncreased risk of mismatch between design and client expectationsDesign freedom for design teamBalancing prescriptive specifications and performance specificationsIn Managing the Brief for Better Design, the authors Blyth and Worthington explain that clients should strike a balance between prescriptive and performance-based specifications in their brief. Requirements should be open enough to enable alternative solutions to be generated, but not so general as to allow anything to pass.