interface

INTERFACE -WEB TECHNOLOGY
R.Pavithra,
II-MSc(IT),
Nadar Saraswathi College of Arts and Science,
Theni.

CONTENTS
 Interface
 User interface
 Graphical user interfaces
 User interface design
 Command interfaces
 Natural language interfaces
 User interface evaluation

INTERFACE
 A boundary across which two independent systems meet
and act on or communicate with each other. In computer
technology , there are several types of interface ..
 The user interface allows the user to communicate with
the operating system, also GUI

THE USER INTERFACE
 System users often judge a system by it sinter face rather
than its functionality.
 A poorly designed interface can cause a user to make
catastrophic errors.
 Poor user interface design is the reason why so many
software systems are never used.

GRAPHICAL USER INTERFACES
 Most users of business systems interact with these
systems through graphical interfaces although, in some
cases, legacy text-based interfaces are still used.

GUI CHARACTERISTICS
Characteristic Description
Windows Multiple windows allow different
information to be displayed
simultaneously on the user’s
screen.
Icons Icons different types of information.
On some systems, icons represent
files; on others, icons represent
processes.
Menus Commands are selected from a
menu rather than typed in a
command language
Pointing A pointing device such as a mouse
is used for selecting choices from a
menu or indicating items of interest
in a window.
Graphics Graphical elements can be mixed
with text on the same display.

GUI ADVANTAGES
 They are easy to learn and use.
-Users without experience can learn to use the system
quickly.
 The user may switch quickly from one task to another and can
interact with several different applications.
-Information remains visible in its own window when
attention is switched.
 Fast, full-screen interaction is possible with immediate access
to anywhere on the screen.

UI DESIGN PRINCIPLES
 UI design must take account of the needs,
experience and capabilities of the system users
 Designers should be aware of people’s physical and
mental limitations (e.g. limited short-term memory)
and should recognize that people make mistakes
 UI design principles underlie interface designsal
though not all principles are applicable to all
designs.

COMMAND INTERFACES
 User types commands to give instructions to the
system e.g. UNIX
 May be implemented using cheap terminals.
 Easy to process using compiler techniques
 Commands of arbitrary complexity can be created
by command combination
 Concise interfaces requiring minimal typing can be
created

NATURAL LANGUAGE INTERFACES
 The user types a command in a natural language.
Generally, the vocabulary is limited and these
systems are confined to specific application
domains (e.g. timetable enquiries)
 NL processing technology is now good enough to
make these interfaces effective for casual users but
experienced users find that they require too much
typing

USER INTERFACE EVALUATION
 Some evaluation of a user interface design should
be carried out to assess its suitability
 Full scale evaluation is very expensive and
impractical for most systems
 Ideally, an interface should be evaluated against a
usability specification. However, it is rare for such
specifications to be produced

interface

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