Software, software Engineering, Software Engineering Layered Technology, These slides provide the details about software and Software Engineering basics.

1. Software Engineering-
Unit 1
INTRODUCTION TO SOFTWARE AND SOFTWARE ENGINEERING
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2. Computer Software
What is IT?
Computer software is the product that software professionals build and then
support over the long term. It encompasses programs that execute within a
computer of any size and architecture, content that is presented as the
computer programs execute, and descriptive information in both hard copy and
virtual forms that encompass virtually any electronic media. Software
engineering encompasses a process, a collection of methods (practice) and an
array of tools that allow professionals to build high quality computer software.
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3. Computer Software
Who does it?
Software engineers build and support software, and virtually everyone in
the industrialized world uses it either directly or indirectly.
Why is it Important?
Software is important because it affects nearly every aspect of our lives
and has become pervasive in our commerce, our culture, and our
everyday activities. Software engineering is important because it enables
us to build complex systems in a timely manner and with high quality.
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4. Computer Software
What are the steps?
You build computer software like you build any successful product, by
applying an agile, adaptable process that leads to a high-quality result that
meets the needs of the people who will use the product. You apply a
software engineering approach.
What is the work product?
From the point of view of a software engineer, the work product is the set
of programs, content (data), and other work products that are computer
software. But from the user’s viewpoint, the work product is the resultant
information that somehow makes the user’s world better
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5. Software Crisis
Software Crisis is a term used in computer science for the
difficulty of writing useful and efficient computer programs
in the required time .software crisis was due to using same
workforce, same methods, same tools even though rapidly
increasing in software demand, complexity of software and
software challenges. With increase in the complexity of
software, many software problems arose because existing
methods were insufficient.
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6. Software Crisis
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7. Software Crisis
Causes of Software Crisis:
1. The cost of owning and maintaining software was as expensive as developing the
software
2. At that time Projects was running over-time
3. At that time Software was very inefficient
4. The quality of software was low quality
5. Software often did not meet requirements
6. The average software project overshoots its schedule by half
7. At that time Software was never delivered
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8. Solution of Software Crisis:
There is no single solution to the crisis. One possible solution of software crisis
is Software Engineering because software engineering is a systematic,
disciplined and quantifiable approach. For preventing software crisis, there are
some guidelines:
1. Reduction in software over-budget
2. The quality of software must be high
3. Less time needed for software project
4. Experience working team member on software project
5. Software must be delivered
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9. Software Engineering
Although hundreds of authors have developed personal
definitions of software engineering, a definition proposed
by Fritz Bauer at the seminal conference on the subject still
serves as a basis for discussion:
[Software engineering is] the establishment and use of
sound engineering principles in order to obtain
economically software that is reliable and works efficiently
on real machines
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10. Software Engineering
The IEEE [IEE93a] has developed a more comprehensive
definition when it states:
Software Engineering: (1) The application of a systematic,
disciplined, quantifiable approach to the development,
operation, and maintenance of software; that is, the
application of engineering to software.
(2) The study of approaches as in (1).
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11. Software Engineering
Software engineering is a layered technology.
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12. Software Engineering
The Quality Focus:
Any engineering approach (including software engineering) must rest
on an organizational commitment to quality. Total quality
management, Six Sigma, and similar philosophies foster a continuous
process improvement culture, and it is this culture that ultimately
leads to the development of increasingly more effective approaches
to software engineering. The bedrock that supports software
engineering is a quality focus.
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13. Software Engineering
Process:
The foundation for software engineering is the process layer. The software
engineering process is the glue that holds the technology layers together
and enables rational and timely development of computer software.
Process defines a framework. that must be established for effective
delivery of software engineering technology.
The software process forms the basis for management control of software
projects and establishes the context in which technical methods are
applied, work products (models, documents, data, reports, forms, etc.)
are produced, milestones are established, quality is ensured, and change
is properly managed.
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14. Software Engineering
Methods:
Software engineering methods provide the technical how-to’s for
building software. Methods encompass a broad array of tasks that
include communication, requirements analysis, design modeling,
program construction, testing, and support. Software engineering
methods rely on a set of basic principles that govern each area of the
technology and include modeling activities and other descriptive
techniques.
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15. Software Engineering
Tools:
Software engineering tools provide automated or semi
automated support for the process and the methods. When
tools are integrated so that information created by one tool
can be used by another, a system for the support of
software development, called computer-aided software
engineering, is established.
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16. References:
https://www.geeksforgeeks.org/software-engineering-software-crisis/
7th edition Software Engineering A Practitioners Approach by Roger S. Pressman
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