Q2 statements (Customer-based definitions) are more in line with customer and market requirements and less abstract than the Q1 statements. It's here where we can now select qualities that are meaningful to a product's usefulness, related to the acceptance by users and the market environment and to the development process; for example:

• Product-features = {four switches, three eyes, green top, voice command, easy to break down for recycling, upgradable...}
• Performance-criteria = {respond in 5 seconds, slows to within 3 inches...}
• Product-reliability = {survives drops from 3 feet, operates 24 hours on 1 battery...}
• Regulated-requirements = {UL safe, Class-B emissions, CE mark...}
• Human-factors = {can be operated with one hand, visible in sunlight...}
• Cosmetic-parameters = {scratches, blemishes, knit marks, relief marks...}
• Visual-parameters = {luminance, color, brightness, angle of view, contrast, hue...}
• Audible-parameters = {loudness (dB), frequency...}
• Environmental requirements = {temperature, altitude, vibration, hazardous substances...

These qualities are developed during the Market Development/ Product Conception Phase of a product development program and are placed in the Marketing Requirements Document - MRD (see reference 3).

Quality For the Product & Production

Q3 definitions (Operations-based definitions) are directly applicable to the technical requirements and technical phases of product development - the product engineering & production phases of a product development program (reference 3). Confidence in replicability (production Quality) is supported by these definitions.

Example qualities established for these phases are:

• Electrical-parameters = {voltage, current, frequency changes…}
• Mechanical-dimensions = {dimensional stack-ups…}
• Software-parameters = {variable domains & ranges, interrupt response time…}
• Invasive-parameters = {particulate matter, biological matter, radiation…}
• Manufacturing process-limits = {diameter, temperature of solder…}
• Interface-ranges = {Legal range of input, line voltage…}
• Calibration-limits = {lumens, dBA…}
• Test-parameters = {HI-POT voltage, flame rating, …}
• Risks = {critical hazard points, product lifetime, …}