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The 80/20 Rule

A high percentage of effects in any large system are caused by a low percent of variables.

• useful for focusing resources and realizing greater efficiencies in design
• can be used to assess the value of elements to target areas of redesign and optimization
• noncritical functions of that are part of the less-important 80 should be minimized or removed from the design

A

Accessibility

Objects and environments should be designed to be usable, without modification, by as many people as possible.

• Perceptibility: when everyone can perceive the design, regardless of sensory abilities
• Operability: when everyone can use the design, regardless of physical abilities
• Simplicity: when everyone can easily understand and use the design, regardless of experience, literacy, or concentration level
• Forgiveness: when designs minimize the occurrence and consequences of errors

Aesthetic-Visibility Effect

Aesthetic designs are perceived as easier to use than less-aesthetic designs.

• more usable but less aesthetic design may suffer a lack of acceptance that renders issues of usability moot

Affordance