A conformance specification is a specification that defines the technical and physical characteristics and/or measurements of a product, such as physical aspects (e.g. dimensions, colour, and surface finish), design details, material properties, energy requirements, processes, maintenance requirements and operational requirements.
On the other hand, performance specification typically includes list of output or outcome or func-tional requirements. Brand name can be a part of performance specification because brand is a re-minder of quality that customers remember. For example, when talking about Roll Royce, people will think about an elegant car.
Reference:
LO 3, AC 3.1