Human Variability

The first important point when it comes to human capabilities and limitations is the concept of variability.

Human variability refers to the differences between individuals in terms of their physical, cognitive, and behavioural characteristics. These differences can have a significant impact on the usability and effectiveness of products and systems, and must be considered when designing products and systems that will be used by a diverse population.

For example, people come in different heights and have different arm lengths, which can impact the size and placement of controls on a product or system. Some people may have physical limitations, such as reduced mobility or strength, which can impact the design of controls and interfaces. Some people may have visual or hearing impairments, which can impact the design of visual and auditory displays and controls.

The important fact is that these capabilities fall along a range.

By taking into account the variability in the physical, cognitive, and behavioural characteristics of people, designers can create products and systems that are tailored to the abilities of the users and that are easy and safe to use.

For example, if a product or system is being designed for elderly users, it is important to consider their physical limitations and cognitive abilities when designing the interface and controls. Similarly, if a product or system is being designed for children, it is important to consider their developmental level and cognitive abilities when designing the interface and controls.