User Interface Specialization: 1. Design

• Simple things should be simple to operate: explanations or instructions are a sign of failure!
• DESIGN PRINCIPLE: 

1. Visibility - The possible operations of these systems or on other artifact should be visible and their purpose in how you use the object should be clear.
2. Feedback: The system provided visual clues or indicators that showed as I said how it was reacting to the user's actions

        Design can save lives

        example:

Design Process:

=>Research => Prototipe => Evaluation=>

    TCUID - Task-centered User Interface Design

Parts of 

Use Case

FFITS LAW

People has short memories and long-term memories. But, for to record a long memory, its cousts a big effort. Because of that, try ever to spend less effort to use a memory and try to make the interface more intuitive and clear.

Other point is the attention. Usually, we cannot pay attention to more than one task. In order of that, a interface with clear and specifcs objectives, without distractions or poltutions, is more effective.

Slips and Mistakes

Are common to the humans.

GULF OF EXECUTE AND GULF OF EVALUATION