The document provides an overview of software engineering, discussing what it is, why it is important, common challenges, and key concepts. It defines software engineering as the application of engineering principles to software development. Major points covered include the software crisis that led to its emergence as a discipline, examples of costly software failures, attributes of good software like maintainability and dependability, different software development models and their costs, and ongoing challenges like managing heterogeneity.
Introduction to software engineering
Software products
Why Software is Important?
Software costs
Features of Software?
Software Applications
Software—New Categories
Software Engineering
Importance of Software Engineering
Essential attributes / Characteristics of good software
Software Components
Software Process
Five Activities of a Generic Process framework
Relative Costs of Fixing Software Faults
Software Qualities
Software crisis
Software Development Stages/SDLC
What is Software Verification
Advantages of Software Verification
Advantages of Validation
Introduction to software engineering
Software products
Why Software is Important?
Software costs
Features of Software?
Software Applications
Software—New Categories
Software Engineering
Importance of Software Engineering
Essential attributes / Characteristics of good software
Software Components
Software Process
Five Activities of a Generic Process framework
Relative Costs of Fixing Software Faults
Software Qualities
Software crisis
Software Development Stages/SDLC
What is Software Verification
Advantages of Software Verification
Advantages of Validation
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
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Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
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lecture 1.pdf
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Chapter 1: Introduction to
Software Engineering
Chapter 1 in Software Engineering Book
2
Overview
Learning Objectives.
What is software engineering?
Why is software engineering important?
3
By the end of this chapter, you will...
Understand what software engineering is.
Understand why software engineering is important.
Know answers to key questions related to the software
engineering discipline.
4
Activity
Think about all the devices and systems
that you encounter in your everyday life
which have software controlling them…
List as many as you can
Virtually all countries
depend on complex
computer-based
systems.
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Why is Software Engineering important?
Complex systems need a disciplined approach for designing,
developing and managing them.
6
Software Development Crises
Projects were:
• Late.
• Over budget.
• Unreliable.
• Difficult to maintain.
• Performed poorly.
7
Software errors….the cost
Errors in computer software can have
devastating effects.
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Software Crisis
Example 1: 2009,Computer glitch delays flights
Saturday 3rd October 2009-London, England (CNN)
• Dozens of flights from the UK were delayed Saturday after
a glitch in an air traffic control system in Scotland, but the
problem was fixed a few hours later.
• The agency said it reverted to backup equipment as
engineering worked on the system.
• The problem did not create a safety issue but could cause
delays in flights.
• Read more at:
http://edition.cnn.com/2009/WORLD/europe/10/03/uk.fl
ights.delayed
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Software Crisis
Example 2: Ariane 5 Explosion
• European Space Agency spent 10 years and $7
billion to produce Ariane 5.
• Crash after 36.7 seconds.
• Caused by an overflow error. Trying to store a 64-bit
number into a 16-bit space.
• Watch the video:
http://www.youtube.com/watch?v=z-r9cYp3tTE
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Software Crisis
Example 3: 1992, London Ambulance Service
• Considered the largest ambulance service in the
world.
• Overloaded problem.
• It was unable to keep track of the ambulances
and their statuses. Sending multiple units to some
locations and no units to other locations.
• Generates many exceptions messages.
• 46 deaths.
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Therefore…
A well-disciplined approach to software
development and management is
necessary. This is called engineering.
12
Software Engineering
The term software engineering first appeared in the 1968 NATO
Software Engineering Conference and was meant to provoke
thought regarding what was then called the “software crisis”..
“.. An engineering discipline that is concerned with all aspects of
software production from the early stages of system specification
to maintaining the system after it has gone into use.” Sommerville,
pg.7
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Software
Software
Programs
Programs
Documentation
Documentation
Data
Data
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What is Software?
System
Documentation
User
Documentation
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Types of Software
• Generic products.
• Stand-alone systems that are marketed and sold to any customer who wishes to buy
them.
• Examples – PC software such as graphics programs, project management tools;
CAD software; software for specific markets such as appointments systems for
dentists.
• The specification of what the software should do is owned by the software developer
and decisions on software change are made by the developer.
• Customized or bespoke products.
• Software that is commissioned by a specific customer to meet their own needs.
• Examples – embedded control systems, air traffic control software, traffic monitoring
systems.
• The specification of what the software should do is owned by the customer for the
software and they make decisions on software changes that are required.
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Software Engineering vs. Computer Science
“Computer science is no more about computers than
astronomy is about telescopes.” Edsger Dijkstra
Computer Science
• Theory.
• Fundamentals.
Software Engineering
• Practicalities of software
design, development and
delivery.
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Software Engineering vs. Systems Engineering
Systems Engineering:
Interdisciplinary engineering field (computer, software, and process eng.).
Focuses on how complex engineering projects should be designed and managed.
Systems Engineering
• All aspects of computer-
based systems
development: HW + SW +
Process.
• Older than SWE.
Software Engineering
• Deals with the design,
development and delivery
of SW.
• Is part of Systems
Engineering.
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Question Answer
What is software? Computer programs and associated documentation. Software
products may be developed for a particular customer or may
be developed for a general market.
What are the attributes of good software? Good software should deliver the required functionality and
performance to the user and should be maintainable,
dependable and usable.
What is software engineering? Software engineering is an engineering discipline that is
concerned with all aspects of software production.
What are the fundamental software
engineering activities?
Software specification, software development, software
validation and software evolution.
What is the difference between software
engineering and computer science?
Computer science focuses on theory and fundamentals;
software engineering is concerned with the practicalities of
developing and delivering useful software.
What is the difference between software
engineering and system engineering?
System engineering is concerned with all aspects of
computer-based systems development including hardware,
software and process engineering. Software engineering is
part of this more general process.
Frequently asked questions about software
engineering
18
Frequently asked questions about software
engineering
Question Answer
What are the key challenges facing software
engineering?
Coping with increasing diversity, demands for reduced delivery
times and developing trustworthy software.
What are the costs of software engineering? Roughly 60% of software costs are development costs, 40% are
testing costs. For custom software, evolution costs often
exceed development costs.
What are the best software engineering
techniques and methods?
While all software projects have to be professionally managed
and developed, different techniques are appropriate for
different types of system. For example, games should always be
developed using a series of prototypes whereas safety critical
control systems require a complete and analyzable
specification to be developed. You can’t, therefore, say that
one method is better than another.
What differences has the web made to
software engineering?
The web has led to the availability of software services and the
possibility of developing highly distributed service-based
systems. Web-based systems development has led to
important advances in programming languages and software
reuse.
19
What is a Software Process?
Activities and results that produce a software product:
SW Process Activity What is going on there?
Specification
What does the customer need?
What are the constraints?
Development Design & programming.
Validation Checking whether it meets requirements.
Evolution Modifications (e.g. customer/market).
20
What is a Software Process Model?
Description of the software process that represents one view, such
as the activities, data or roles of people involved.
Examples of views Focus on…
Workflow
Activities = human actions.
What is input, output, and dependencies.
Dataflow
Activities = transformations of information.
How the input is transformed into output.
Role/Action
What is the role of people involved in each step of
the process?
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Software Process Models
Waterfall approach Iterative development
Component-Based
Software Engineering CBSE
assembled form existing
components
22
The Cost of Software Engineering
Depends on:
The process used, and
The type of software being developed.
Each generic approach has a different profile of cost distribution.
Roughly 60% of costs are development costs, 40% are testing costs.
For custom software, evolution costs often exceed development
costs.
23
Cost distribution
Custom software development (Bespoke)
Software Model
Cost units
Cost distribution
Software development activity
Waterfall Model
0 25 50 75 100
Specification Design Development Integration and testing
Iterative Development
0 25 50 75 100
Specification Iterative Development System testing
Component-basedSoftware Engineering
0 25 50 75 100
Specification Development Integration and testing
Developmentand evolutioncosts for long-lifetime systems
0 100 200 300 400
System development System evolution
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Cost distribution
Generic software development
Product development costs
0 25 50 75 100
Specification Development System testing
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What is CASE?
Computer Aided Software Engineering.
Programs that support:
Requirements analysis.
System modeling.
Debugging.
Testing.
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Attributes of good software
Functional attributes (performance; what the system does).
Non-functional attributes (quality; how the system does it).
Product Characteristic Description
Maintainability Evolution qualities such as Testability, extensibility.
Dependability Reliability, security, safety.
Efficiency Response time, processing time, memory utilization.
Usability Easy to learn how to use the system by target users.
Efficient to use the system by users to accomplish a task.
Satisfying to use by intended users.
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Activity
What are the key attributes for..
Interactive game Banking system
Cardiac monitor in an ICU
unit
Players, score, scenes,
theme.
Client accounts, stocks
bonds, money transfers.
heart rate, temperature,
blood pressure.
28
Challenges facing software engineering
Challenge Why? Software needs to ..
Heterogeneity
Different computers, different
platforms, different support systems.
Cope with this variability.
Delivery
Businesses are more responsive
supporting software needs to
evolve as rapidly.
Be delivered in shorter time
without compromising quality.
Trust
Software is a part of many aspects of
our lives (work, study, leisure).
Demonstrate that it can be
trusted by users.
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References
PRESS&SUN-BULLETIN, The Binghamton Press Co., Binghamton, NY, October 1,1999.
“Software Hell: Is there a way out?”, BUSINESS WEEK, December 6, 1999.
IEEE Standards Collection: Software Engineering, IEEE standard 610.12-1990, IEEE 1993.
Sommerville, Ian “Software Engineering”, 9th edition, Addison-Wesley.