To measure HCI, you need to involve many influencing factors, which will determine the effectiveness at the emotional level. The effectiveness of HCI can be measured by how easy a computer system is to use by humans. For an IT system to be effective, HCI levels must be easy to use, especially for people with disabilities, because if it is difficult to use, people are not able to function effectively, which means that the system is not good. My interface design should have fewer features, functions and steps. There are many ways to measure the effectiveness of HCI testing, such as speed of interaction, number of errors related to actions, ease of understanding by the user. You can also measure the time it takes the user to complete a specific task (speed). This can be done by bringing in a few testers (more testers is better) to test your system and get their feedback on the system. You can time how long it takes a tester to complete a particular task, average the total time of the people who tested the system, and compare the result with the other system. In order to test the system and get personal feedback on the system, you have created tests that must be planned carefully. When testing, you need to time how long it would take the user to perform and complete a particular task. After examining the result, you should find ways to speed up the process, for example by having fewer keys or enlarging the writing and buttons, etc. The efficiency of a system can be measured by: • How quickly the user can enter a command • The speed with which a user can enter any data • The throughput speed or response given by the interface • The time it takes for the user to understand the result This should be...... middle of paper that you can use to help them if they have a problem. You need to provide support material to the user and this could be done by suggesting tips/tricks to users which should be easily found without the user searching for hours. There should also be a different design for different people, for example a different design for people with disabilities. The design should have certain features that support people with disabilities, such as people with color blindness. The KLM Model or Key Level Model, which was developed by David Kerias who designed an 11-step guide for organizations to determine how long it takes to complete simple data entry tasks using a computer and a mouse. It has proven to be the most effective way to test the ability to enter information using a computer and a mouse. This is a great method to follow when creating an HCI.