CS408 Human Computer Interaction Assignment No. 01 2012

CS408 Human Computer Interaction Fall Semester Assignment No. 01, 2012 Due Date:06-11-2012
Total marks = 20

Deadline: 06-11-2012


Consider an Elevator system, where few persons rush into the elevator on the 18th floor of a 20 story building Plaza.

A person named Imran also steps into the elevator. He is not a regular user of the elevator. Imran wants to go to the first floor.

There are two panels on the right side of the door in front of him; one is control panel, where numbers of buttons are displayed labeled; “1”, “2”, “3” , up to “20” along with “Door Open” & “Door close” etc. In the second panel guidelines are given about how to handle the elevator.

For few seconds, he concentrates on the buttons and presses the “Door Close” button. Then again he thinks and presses “1” (i.e. the button to go to first floor). Finally he arrives at the first floor and steps out to his desired floor.


Map the human processor model and all its parts (Components) that come into play, on above scenario.

Note: Before attempting the assignment, go through the Human processor model and all its parts.


1. imran get input from eye his perceptual system come into action.
2. input gives to the working memory where cognitive system come into action.
3. cognitive system do some processes and after the it call the motor system for desire work.

Mr. Imran is not a regular user of the elevator system. So, his mind is doing following processes.

  1. Perceptual System
  2. Cognitive System
  3. Motor System


I will explain these, how Imran drives the elevator system for the first time. When

he entered in the elevator for the first time, his perceptual system is came into action. The perceptual system perceive the around environment using eyes and get the input (image of the panel that drives the elevator) and send this image to memory for further processes.

And then motor system came into action and turned the imran’s eyes again toward the panels for getting more information.


Imran’s eyes look again on the panels, got an image of elevator using instruction and read one by one. When he read the first instruction, cognitive and motor systems working simultaneously and instructions are also storing in the long term memory.  After this perception system again perceive the button panel. It gives all the information to memory. When he looks the “Door close” button, the perception system sends the image of the button to memory where cognitive process comes into action. It compares the new information with the already stored information. The cognitive system tells the meaning of this information to the motor system. It comes into action and Imran’s hand bush the “Door close” button. Similarly, the next information processes and he push the “1” for his desire location.

Flow chat of this process:


Relevant Answer:

Human processor model or MHP (Model Human Processor) is a cognitive modeling method used to calculate how long it takes to perform a certain task. Other cognitive modeling methods include parallel design, GOMS, and KLM (human-computer interaction). Cognitive modeling methods are one way to evaluate the usability of a product. This method uses experimental times to calculate cognitive and motor processing time. The value of the human processor model is that it allows a system designer to predict the performance with respect to time it takes a person to complete a task without performing experiments. Other modeling methods include inspection methods, inquiry methods, prototyping methods, and testing methods.

The standard definition for MHP is: The MHP draws an analogy between the processing and storage areas of a computer, with the perceptual, motor, cognitive and memory areas of the computer user.

The human processor model uses the cognitive, perceptual, and motor processors along with the visual image, working memory, and long term memory storages. A diagram is shown below. Each processor has a cycle time and each memory has a decay time. These values are also included below. By following the connections diagrammed below, along with the associated cycle or decay times, the time it takes a user to perform a certain task can be calculated. Studies into this field were initially done by Card, S.K., Moran T.P., & Newell, A. (1983). Current studies in the field include work to distinguish process times in older adults by Tiffany Jastrembski and Neil Charness (2007).