The Concept of Human-Machine Interface (HMI)
The user-friendly Humans Machine Interface is important sticking point for data acquisition and surveillance systems can help operator carry out their tasks with minimum expended effort, including a minimum of errors. For most of operators are concerned, user-friendly HMI is operational key of efficient and more important than the architecture of the internal workings.

The task of an HMI is to make the function of a technology self-evident. Much like a well-designed hammer fits the user's hand and makes a physical task easy, a well-designed HMI must fit the user's mental map of the task is user wishes to carry out.

The rule of Humans Machine Interface
1. For users learn the HMI quickly
2. Reduce of operational errors.
3. Improve the productivity.

The Usability Engineering