Common Industry Specification for Usability–Requirements(CISU-R)
The purpose of the Common Industry Specification for Usability - Requirements (CISU-R) is to provide a structure for:
- Defining usability requirements in sufficient detail to make an effective contribution to design and development,
- Defining usability criteria that can be empirically validated subsequently if needed.
Who can use a specification of requirements based on the CISU-R?
A specification of requirements based on the CISU-R may for example be used by individuals with the following roles to accomplish the following objectives:
- Usability professionals and designers in supplier organizations to decide whether usability requirements specified by a customer are realistic, and to plan how to ensure that a product meets these requirements.
- Other technical professionals and managers in supplier organizations to decide whether to accept usability requirements.
- Usability professionals in customer organizations to include usability in a Request for Proposals.
- Other technical professionals and managers in customer organizations to assess if the usability requirements specified by supplier organization meet the needs of the customer organization.
How the CISU-R can be used?
The information in the CISU-R supports communication between the parties involved to obtain a better understanding of the usability requirements. The communication may be:
- Among members of the development team, to specify requirements for use by the development team. (In this case the usability requirements may be incorporated into existing documents rather than forming a stand-alone document.)
- Between the customer and supplier of a custom product, to define specific customer requirements.
- Between a range of potential customers and a supplier of an off the shelf product, to define diverse requirements.
There are three levels of compliance to the CISU-R:
Level 1: Context of use
Context of use provides information on intended use. To achieve Level 1 compliance, usability requirements shall specify
- The stakeholders
- The intended user groups.
- The main goals for each user group.
- The intended computing or other technical environment.
- The intended physical and social environments.
- Scenarios of use specifying how users carry out their tasks in a specified context.
- Any prerequisite documentation or training materials.
The following information should be provided:
- Which measures in Level 2 could be used to measure usability.
Level 2: Usability measures.
Usability measures provide evaluation criteria for defined scenarios of use of the product, against which the usability of the product can be evaluated. For Level 2 compliance, appropriate measures shall be specified that may include:
- Performance measures, such as effectiveness and efficiency of achieving user goals.
- Satisfaction measures using an established questionnaire.
Level 3: Test method.
The test method specifies how it is planned to evaluate that the usability requirements have been met.