Slide 1: HUMAN COMPUTER INTERFACE AUTHOR : AUTHOR PRADEEP KUMAR
B.tech 1st year
Gnyana saraswati college of eng. & technology
Dharmaram(b) OUTLINE : OUTLINE Introduction
Importance of HCI
Disciplines contributing to HCI
Principles of HCI design
Model of HCI
HCI design models INTRODUCTION : INTRODUCTION Human factors related to computer can roughly divided into topics related to hardware design & topics related to design of the software interface
Hardware should be designed to maximize task perfomance & minimize ergonomic problems or hazards
Software interface refers to the information provided by the computer and the control mechanisms for information inputting Slide 5: HUMAN - COMPUTER INTERFACE Human
the others in the organisation
software Interface : Interface A point where two objects meet.
A point where the human can tell the computer what to do. A point where the computer displays the requested information. Interfacing : Interfacing Importance of HCI : Importance of HCI Productivity
individual (e.g. installations, word processing)
organisational (changing job content, satisfaction, working environment, power and influence)
Safety (e.g. nuclear plants, flight control) Disciplines, contributing to HCI : Disciplines, contributing to HCI Computer science
Social & organisational psychology
Philosophy, sociology, anhtropology Principles of HCI design : Principles of HCI design Recognise diversity
Strive for consistency
Error prevention and similar error handling
Reduce short term memory load Computer Match : Computer Match A good interface match would include as many senses as possible.
Computer input and output is basically seeing what we enter and what is displayed.
Sound can be added to some programs, either by giving instructions by voice, or listening to a commentary / music.
Touch can be in the form of using the mouse, a joystick, or a drawing tablet. Virtual Reality : Virtual Reality Virtual Reality is a computer interface.
The applications programs combine the interfaces already mentioned to give a simulated three dimensional world of sight, sound, touch and movement.
Interaction may be made through special equipment such as: spectacles, gloves, sound systems, and the computer and monitor.
As these types of interfaces develop and become more advanced (realistic) through high level programming, so the human use will become more common and so it will seem to be similar to communication with other humans. Natural Language : Natural Language Normal speech recognised by a computer is Natural Language Interface. Talk to a computer and it recognises what we want.
Natural means human-like, and the technology is leaning towards getting computers to behave in a more natural way. Graphical User Interface (GUI) : Graphical User Interface (GUI) Used on computers first by Apple Macintosh, and afterwards by Microsoft.
The memory and file management are done by the operating system while applications are running – Multi-Tasking.
A mouse is used to point and click on icons instead of typing in a command.
Dialogue boxes, menus, icons, toolbars etc form the window on the computer screen. Command Driven Interfaces : Command Driven Interfaces Had to type in a command.
The syntax had to be correct.
Difficult for inexperienced users.
Example above: Microsoft DOS, and UNIX.
Advantages: Powerful, Quick, and Flexible.
Disadvantages: Difficult, need experience, Syntax difficult to remember, typing mistakes! A model of HCI : A model of HCI People Technology Work Level 1 Level 2 Level 3 Socialsystem Organisationalgoal HCI design models : HCI design models Waterfall model
The star life cycle model
Rapid prototyping The waterfall model : The waterfall model Requirements analysis & specification System & software design Implementation & unit testing Integration & system testing The star life cycle : The star life cycle Task analysis / functional analysis Requirements specification Conceptual design / formal design Prototyping Implementation Evaluation Rapid prototyping : Rapid prototyping Referred websites : Referred websites IBM HCI design guide at http://www.ibm.com/ibm/hci/guidelines/design
Terry Winograd, Donald Norman Slide 22: Thank you