chapter 6
HCI in the software
process
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HCI in Software Process: Usability Engineering and the Software Lifecycle, Slides of Human Resource Management
The role of human-computer interaction (hci) in the software process, focusing on usability engineering and the software lifecycle. It covers the importance of designing for usability throughout the life cycle, the waterfall model and its activities, usability engineering principles, and usability specification. It also introduces the iso usability standard 9241.
Typology: Slides
2012/2013
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chapter 6
HCI in the software
process
HCI in the software process
- Software engineering and the design process
for interactive systems
- Usability engineering
- Iterative design and prototyping
- Design rationale
The waterfall model
Requirements specification
Architectural design
Detailed design
Coding and unit testing
Integration and testing
Operation and maintenance
Activities in the life cycle
Requirements specification
designer and customer try capture what the system is expected to provide can be expressed in natural language or more precise languages, such as a task analysis would provide
Architectural design
high-level description of how the system will provide the services required factor system into major components of the system and how they are interrelated needs to satisfy both functional and nonfunctional requirements
Detailed design
refinement of architectural components and interrelations to identify modules to be implemented separately the refinement is governed by the nonfunctional requirements
The life cycle for interactive
systems
cannot assume a linear
sequence of activities
as in the waterfall model
lots of feedback!
Requirements specification
Architectural design
Detailed design
Coding and unit testing
Integration and testing
Operation and maintenance
Usability engineering
The ultimate test of usability based on measurement of user experience
Usability engineering demands that specific usability measures be made explicit as requirements
Usability specification
- usability attribute/principle
- measuring concept
- measuring method
- now level/ worst case/ planned level/ best case
Problems
- usability specification requires level of detail that may not be
- possible early in design satisfying a usability specification
- does not necessarily satisfy usability
ISO usability standard 9241
adopts traditional usability categories:
- effectiveness
- can you achieve what you want to?
- efficiency
- can you do it without wasting effort?
- satisfaction
- do you enjoy the process?