Design is human centered and, therefore, designers need to ensure that the products they design are the right size for the user and therefore comfortable to use. Designers have access to data and drawings, which state measurements of human beings of all ages and sizes. Designers need to consider how users will interact with the product or service. Use and misuse is an important consideration.

• Anthropometric data: static and dynamic data, structural and functional data

• Primary data versus secondary data

• Percentiles and percentile ranges

• Range of sizes versus adjustability

• Clearance, reach and adjustability

• Collecting anthropometric data considering reliability and limitations

• Interpreting percentile tables for user populations

• Design contexts where different percentile ranges are used

The analysis of the human information processing system requires you as a designer to critically analyse a range of causes and effects to identify where a potential breakdown could occur and the effect it may have.