God, grant me the serenity to accept the things I cannot change, The courage to change the things I can, And the wisdom to know the difference. (Serenity Prayer, Reinhold Niebuhr)

Characteristics of Quality

Product Characteristics (Westcott 2013)

Service Characteristics (Westcott 2013)

Freedom from Deficiencies (Gryna 2007)

Effects are that features commonly have a positive effect on sales but also can increase costs due to increased design quality. Freedom from deficiencies usually decrease cost.