Examples include
financial analysts and PhD chemists.
Domain experts spend most of their time with the team, figuring out the details of upcoming stories
and standing ready to answer questions when programmers ask. For complex rules, they create
customer tests (often with the help of testers) to help convey nuances.
NOTE
On small teams, product managers often double as domain experts.
Interaction designers
The user interface is the public face of the product. For many users, the UI is the product. They judge
the product??™s quality solely on their perception of the UI.
Interaction designers help define the product UI. Their job focuses on understanding users, their needs,
and how they will interact with the product. They perform such tasks as interviewing users, creating
user personas, reviewing paper prototypes with users, and observing usage of actual software.
T H E X P T E A M 31
NOTE
Don??™t confuse graphic design with interaction design. Graphic designers convey ideas
and moods via images and layout. Interaction designers focus on the types of people
using the product, their needs, and how the product can most seamlessly meet those
needs.
You may not have a professional interaction designer on staff.
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