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Stages of HMI
There are 4 stages of HMI. This involves the activities of intention, selection, execution and evaluation.
Intention: This is the first stage of HMI. In this stage, the user first sets the goal for interaction.
And then perform actions using a system to reach the goal. This is a mental stage.
Selection: This stage is also defined as the selection of action. In this stage, order of actions is
set. This means that the user defines how the interaction is going to take place.
Execution: Once the course of action is set, it moves on to execution. In this stage, the action is
performed.
Evaluation: This is very important stage in HMI, as the success of the interaction depends on the
feedback.
We can understand these stages in simple terms through an example of celebration of a birthday
party. Neha has an intent to celebrate her birthday party. She decides to celebrate it in a hotel. This
stage is called intention. She selects a hotel and decides on a few friends and relatives with whom
she would like to share her day. This is the selection stage. Finally, she picks up her friends and
relatives in a car and drives to reach the hotel. She orders the meal. This is called the execution
stage. Could she celebrate her birthday? Were her friends happy? Did the meal served to them reach
their level of expectation? Asking and answering these questions are termed as evaluation.
Information Literacy
Quest Technology Literacy
1. Name any 2 stages of HMI.
2. Explain execution stage.
Types of HMI
We have learned about the HMI and its stages. Now, lets learn about the different types of
Human-Machine Interaction in this section.
Menu Driven Interface
This interface lets its users to interact using screens or menus. It is a very common way of interaction.
You switch between menus to reach your goal.
Humans and Machines 105

