Software AND its Types & CASE toolS

Topic:
•SofTware aND
iTS TypeS
&
• caSe Tool
kashifshafqat25@yahoo.com

preSeNTeDpreSeNTeD
by
KaShif ShafqaT(6905)

software
• “A set of instruction given to the computer
to solve a program is called software.”
• “software is a collection of programs that
performs a particular task.”
• Software is also called program.
• Different software’s are used to solve
different problems.

Software
System software Application software
Operating
system
Utility
program
Device
driver
Custom
software
Package
software
Freeware shareware
shareware
shareware
Freeware
Freeware
Freeware
Freeware shareware
shareware

Hardware depend on software
• The HW needs SW to be useful; the SW
needs HW to be useful
• When the user needs something done by
the computer, user gives instructions in
the form of SW to computer HW

Two type of software
• System SW:
– Programs that generally perform the background
tasks in a computer. These programs, many times,
talk directly to the HW
• Application SW:
– Programs that generally interact with the user to
perform work that is useful to the user. These
programs generally talk to the HW through the
assistance of system SW
• It is also know as application packege.

System software
• function of System software
1.Reading data and receiving information.
2.Translating data and instruction.
3.Controlling all the peripheral devices.
4.Processing and generating output.
5.Saving data on disk.
6.Making computer to work for us.

Example SW
Example of system software’s are:
• operating system
• Utility programs
• Device drivers

Operating system(os)
• An operating system (OS) is a collection
of software that manages computer
hardware resources and provides
common services for computer programs.
• Example:
• DOS
• LINUX
• UNIX
• WINDOWS kashifshafqat25@yahoo.com

Utility program
• Utility program is a system software that
allows a user to analyze , configure and
maintain the computer.
• It performs a specific task related to the
management of computer.
• Example:
• 7-zip, WinZip
• VLC or GOM player
• AVG Antivirus

Device driver
• A Device driver is a computer program
that operates or controls a particular type
of devices that is attached to a computer
• EXAMPLE:
• Like printers
• Video adapters
• Network cards
• Sound cards

• Application SW
– Programs that generally interact with the user to
perform work that is useful to the user.
– Application SW is created to perform specific tasks a
user.
• Application SW is used to perform
various applications on the computer.
• Example:
Example of system software’s are:
• Custom software
• Package software

Custom software
• Custom software (also know as bespoke
software or tailor made software’s)
Is software that is specially developed for
some specific organization or other user.
• EXAMPLE:
• Hospital
• College
• Organization name

Packaged software
• Packaged software is a software that is
ready –made and available for sale ,lease
or license to the general public
• EXAMPLE:
• Acrobat
• Reader
• Photoshop

Another way of classifying SW
• Shrink-Wrapped SW
– You can just go to a shop and buy it
• Custom-built SW
– You cannot just go to a shop and buy it; you
have to find someone who can develop it for
you

Freeware SW License
• Also known as “Public Domain SW”
• Allows the user free use of the SW
• The author, however, generally retains
ownership
• Can usually be downloaded from various
Web sites
• Examples: Linux; LaTeX; Netscape Web
browser – the Navigator; MS Web browser
– the Internet Explorer

Shareware SW License
• Allows the user free use of the SW, but
with a request that the user pay the author
a small amount (US$10-50) if the user is
satisfied with the SW
• The author retains ownership
• Can usually be downloaded from various
Web sites
• Examples: WinZip, Download Accelerator

Trialware
• Similar to shareware, but different
• The SW is usable for a short period only
• After an initial trial period that can range
from a week to a few months, the SW self-
destructs
• Can be downloaded from the Internet or
alternatively, the user can receive a copy
my snail-mail by writing to the maker of
the SW

CASE tools

Computer –Aided Software
Engineering(CASE)
A collection of tools used to support the
software development process.
(CASE) is the use of software tools to
assist in the development and
maintenance of software.

What is CASE TOOLS?
• CASE tools are programs (software) that
support one or more phases of a system
development life cycle.

Why CASE is used?
• Best Quality of software
• Decrease cost
• Increase speed
• Most important thing is it remove the
human error by auto correct

Components of CASE TOOLS
Upper CASE
Lower CASE
Cross Life
Cycle CASE

•Upper CASE
Upper CASE is focused in supporting
project identification and selection, project
initiation , project planning, analysis and
design.
• Lower CASE
Lower CASE provides support for
the implementation and maintenance
phases.

Cross Life Cycle CASE
Examples:
Lower CASE tools are code designers
and program editors, and these tools
support the coding, testing and debugging
phase.
Cross life cycle CASE supports activities
that occur across multiple phases of the
SDLC.

CASE TOOL TYPE
 Diagram tool
 Documentation tool
 Process modeling tool
 Analysis and design tool
 System software tool
 Project management tool
 Prototype tool
 Database manage tool
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CASE Tool Repository
• Heart of CASE tool is the central
repository.
• Store all the information to analyze,
create, design and modify an application
from feasibility to implementation and
maintenance.

CASE TOOL offer several benefits
• Improve project management
• Improved system quality
• Increase productivity
• Reduced development time and effort
• Easier and better maintenance of
software system
• Better documentation.

Software AND its Types & CASE toolS

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