1. Chapter 19 Case study on requirements, design, and evaluation: NATS

2. The Final Approach Spacing Tool (FAST)
National Air Traffic Services
Air Traffic Management Systems
Airspace corridors
Lower airspace, Upper airspace
Final Approach Control
The FAST User Interface
UIDE Chapter 19

3. UIDE Chapter 19

4. UIDE Chapter 19

5. UIDE Chapter 19

6. Completed FAST Interface
Landing Sequence
Countdown to turning
UIDE Chapter 19

7. UIDE Chapter 19

8. How the Team Developed FAST
NATS Research and Development
Improving and developing air traffic management systems
The Human Factors Unit
Analyzes the work of the controllers and works to help project teams design air traffic management systems.
The FAST Project Team
5 members
Project manager
Requirements engineer
Software developer
Algorithm developer
Human Factors practitioner
Others as needed
UIDE Chapter 19

9. Requirements Gathering
The Domain, Users, Environment, and Usability Requirements
The Air Traffic Controllers and LATCC
The Tasks Carried Out by Air Traffic Controllers Using FAST
The Air Traffic Control Room
Usability Requirements
UIDE Chapter 19

10. Requirements Gathering
How the Project Team Gathered the User Requirements
Visited the facility
Observed controllers performing their tasks
Interviewed controllers
Informal discussions
UIDE Chapter 19

11. The Design and Evaluation of the User Interface
Design by Prototyping
Low-Fidelity Prototyping
Paper prototypes -> emulation with PowerPoint
High-Fidelity Prototyping
Iterative C++ development
UIDE Chapter 19

12. Preparing to Evaluate Writing the Evaluation Plan Choosing the Users
Stages of evaluation
Objectives of each evaluation
How to conduct the evaluations
Choosing the Users
Representative controllers
Creating the Correct Physical Environment
Current system’s Operations Room
Planning the Evaluation Sessions
Different times during the work periods
UIDE Chapter 19

13. UIDE Chapter 19

14. Observing the Controllers
Debriefing Sessions
Problems, likes, dislikes, changes needed
Questionnaires
Complement the debriefings
Workload Assessment Tool
Individual self-assessment tool (ISA)
Some Changes Resulting from Having Observed the Controllers
UIDE Chapter 19

15. UIDE Chapter 19

16. Inspecting the User Interface
Predicting the Likelihood of Errors
Predictive evaluation, inspection (walk-through)
Is the correct answer evident to the user?
Can connect description to correct action?
Will user know if they made the correct/incorrect choice?
Guideline Review – Style Guidelines reviewed
A Change Resulting from Having Inspected the User Interface
UIDE Chapter 19

17. Analyzing and Interpreting the Evaluation Data
To help understand the weaknesses of the design and how to overcome them
Communicating the Findings to the Customer
Involve all stakeholders in the evaluation process
Keep stakeholders informed of all evaluations
UIDE Chapter 19