ISO 9241-210: Ergonomics of human–system interaction — Part 210: Humancentered design for interactive systems

This ISO standard discusses about designing interactive systems using human-centered design
approach. The standard does not provide any specific design methodology for designing
effective interactive systems. But, it gives a complementary human-centered design approach
that can be fitted into any of the existing design methodologies.
This standard recognizes user experience as one of the important component for designing
interactive systems. Improving user experience is one of the rationales behind the adoption of
human-centered design approach for designing interactive systems.
The standard defines user experience as “person’s perceptions and responses resulting from
the use and/or anticipated use of a product, system or service. “ The standard gives following
characteristics of UX:

UX Composition
 It includes all the users’ emotions, beliefs, preferences, perceptions, physical and
psychological responses, behaviors and accomplishments that occurs before, during
and after use.

Antecedents of UX
 System factors: brand, image, presentation, functionality, system performance,
interactive behavior and assistive capabilities.
 User factors: internal or physical state resulting from previous experiences, attitudes,
skills, personality, strengths, limitations, expectations and preferences.
 Context of use

Relation with usability:
 This standard argues against the misconception about the relation between UX and
usability. According to standard, usability is closely related to UX. This is due to the fact
that usability can cover perceptual and emotional aspects of user experience when
considered from users’ personal goals point of view.

Designing UX
Designing UX is the innovative process which takes into consideration emotional and aesthetic
user satisfaction, efficiency and effectiveness. According to the human-centered approach for
designing interactive systems, the design should address the whole user experience.
Design decisions play important role in enhancing the overall UX. One of the design decisions
related to designing UX is proper allocation of functions between the technology and human
users. The allocation of functions should be done based on the complete understanding of the
intended context of use – including users’ roles and tasks and their outputs. For example: when
the user experience of the product for organizational setup is being designed then impact of
organization and job should be considered. Similarly, for designing how the user accomplishes
the tasks should be considered in contrast to how the system should look.

The main contribution of this standard is:
1. introduction of UX
2. UX definition from practitioners’ point of view which has been confirmed by survey study
conducted on 275 researchers and practitioners from academia and industry.
3. different views on relation between usability and UX