Factors that influence the effect being studied, such as the experience of users being related to their age; also changes in a design which affect other parts of the design and make it difficult to study individual aspects.
Used in pages 79, 83, 133
Factors that influence the effect being studied, such as the experience of users being related to their age; also changes in a design which affect other parts of the design and make it difficult to study individual aspects.
Used in pages 79, 83, 133