What is HCI?
These points are adapted from the ACM SIGCHI statement (see
pp. 3-4 in the text):
- Design, evaluate and implement interactive computing systems
for human use
- Study phenomena surrounding human use of interactive systems
Note that this course emphasizes design and evaluation.
Implementation is generally covered in other courses (e.g. IT
130). We will also study human behavior related to HCI.
Goals of Human-Computer Interaction
- Create usable software-enabled products
and user-interfaces
- Enhance the usability of existing products
- Identify problems and tasks (such as in the workplace) that
can be addressed with software products
Dimensions of usability
Our text cites the list used by Eason (1988):
- Safety (also consider security)
- Utility (sometimes call usefulness)
- Effectiveness (too vague and general to be helpful)
- Efficiency
- Usability (often this term refers to the whole list, learnability is a better term)
- Appeal (aka user satisfaction, likeability, attitude)
Effectiveness seems to be one of the most abused usability terms.
Often practioners use the term usability to refer to all user-centered
design goals. For this course, we will generally focus on the
following dimensions:
- Utility
- Learnability
- Efficiency
- User satisfaction
HCI practitioners need to be mindful of other practical
considerations when designing their products. These include the
impact of legacy systems, portability and reliability.
Discussion items:
- What are examples of software-enabled interactive products?
- Identify products with usability problems. To which
usability objectives (i.e. learnability, efficiency, etc.) do
the problems correspond?
- Often usability objectives have inherent tradeoffs. What
are examples? For example, in which situations might improving
learnability negatively affect efficiency?
- How might we measure the dimensions of usability?
- Here's a picture of a bathroom light switch at my parent's
house. The switch on the left (nearest to the door) controls
the light above the sink. The switch on the right controls the
light over the bathtub, which is on the other side of the room
from the sink. Is this a good design? What usability measures
matter? Under what circumstances?
Last modified: Wed Sep 06 17:06:45 Central Daylight Time 2006