The document discusses key concepts in software engineering. It defines software engineering as applying systematic and technical approaches to develop reliable and efficient computer software. It describes various software development models including waterfall, prototyping, RAD, spiral and evolutionary models. It also discusses software engineering layers, characteristics, applications, and process models. Finally, it covers concepts like fourth generation techniques, software project management, estimation techniques, and risk management.
Software development process models
Rapid Application Development (RAD) Model
Evolutionary Process Models
Spiral Model
THE FORMAL METHODS MODEL
Specialized Process Models
The Concurrent Development Model
Software development process models
Rapid Application Development (RAD) Model
Evolutionary Process Models
Spiral Model
THE FORMAL METHODS MODEL
Specialized Process Models
The Concurrent Development Model
SDLC [sometimes termed as Systems Development Life-cycle] is an acronym for Software Development Life Cycle which follows a systematic process to unravel a software while following problem handling methodologies and analysis.
The Egg Analogy: The Problem With Designer and Developer Workflow in Software...Chris Bernard
This is a version of the egg slides that many of us use at Microsoft to talk about designer and developer workflow. They were created by Expression Product Manager Jon Harris.
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Software Engineering in a Quick and Easy way - v1.pdfKAJAL MANDAL
The Most Common must know Software Development life cycle Models. As we discussed in our earlier article on Software Engineering, we have learned about the aspects of Software Engineering and the qualities that it should possess. Now let us move ahead and learn about the models of the software development life cycle. What is a software development life cycle? A software development life cycle, sometimes also called the SDLC life cycle, represents and describes the various activities that are to be performed to build a software product. These activities are grouped into several phases and sequentially linked in order. Hence we can also say, that a software development life cycle is a structured list of activities that are followed to develop software, from the inception to the delivery of the final product. During any phase of the life cycle of development, one or more activities might have to be carried out to start or finish that phase. For example, in the inception phase of actual coding, it is expected that the architectural designing phase is completed. Why software development life cycle model is required? In every model of SDLC, every phase may have its own child life cycle, for every team of a specific skill set. So in an environment of complicated projects and a variety of skill-based teams, it is vital to follow a pre-defined structured process. This creates discipline and maintains decorum in the working culture. All team members are interdependent. Failure of any one team will affect the deliverables of other teams. And all together it might lead to project failures. SDLC also defines entry and exit criteria for every phase. For example, say, if a team member starts coding, assuming that pro-activeness will help finish the project much earlier. This would be the perfect recipe for disaster and project failure. Why? Because, after putting down a month of effort they might realize that the project needs a roving vehicle on Mars to collect data. Unfortunately, the team doesn’t have that with them. So they can not proceed further. That means a feasibility study was not performed before the team started working on deliverables. Which in technical terms, is a breach of SDLC, and hence the loss of effort, or project failure. The team should have done a feasibility study before jumping straight into deliverables. Then they would have realized that the project is not doable, many days in advance. As so, they could have saved some unnecessary effort. Hence it is strongly suggested to follow a methodology, or process while working on complex and team-based projects. It becomes easier for the entire team to work together, support each other, manage, and track the progress of the development. Regardless of the model you follow, SDLC models always ensure smooth delivery, reporting, and chaos-free delivery of the project. Classic Waterfall Model. Prototyping Model. Iterative Waterfall Model. Rapid Action Development. Spiral Model.
Process models are not perfect, but provide road map for software engineering work. Software models provide stability, control, and organization to a process that if not managed can easily get out of control
Software process models are adapted to meet the needs of software engineers and managers for a specific project.
This is about software engineering.Software engineers apply engineering principles and knowledge of programming languages to build software solutions for end users. Software engineers design and develop computer games, business applications, operating systems, network control systems, and middleware—to name just a few of the many career paths available.
The software development life cycle, or SDLC, encompasses all of the steps that an organization follows when it develops software tools or applications.
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Model Attribute Check Company Auto PropertyCeline George
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2. Software
Software is
A information transformer – Producing, managing,
acquiring, Modifying, displaying or transmitting
information that is simple/ complex which is
satisfies the users needs & makes the user world
better.
A software is either a collection of programs
which will transfer the data from one place to
another
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3. Engineering
It is systematic and technical approach which tells
you the methods to carry out the work.
It can de defined as Applying something technical
method or algorithm in a systematic way.
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4. Software Engineering
Software engineering is the establishment and use of
sound engineering principles (applying some software
methods) in order to obtain economically software that is
reliable(not working properly) and works efficiently on real
machines.
Software engineering is a discipline that integrates
process methods and tools for the development of
computer system.
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5. Software Engineering Layers
Process layer : It is glue that holds the technology layers
together and enables timely. In other way we can say the
technology we are using produce accurate result.
Methods : Provides the technical (which platform) how-
to’s for building software. It is a set of basic principles
that govern each area of technology.
Tools: Provides automated and semi automated support
for process and method e.g MS excel tool is used to
applying some formula’s.
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6. Software characters
Software is developed or engineered, it is not
manufactured in the classical sense.
Software does not wear out. (design and develop is
available every where it is product) car example
Although industry is moving towards component based
assembling most software continues to be custom built.
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7. Software Application
System software
Real time software
Business software
Engineering and scientific software e.g CAD, CAM
Embedded software
Personal computer software
Web based software
Artificial intelligence software
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8. Software process model
what is software process model ?
A process model describes the sequence of phases for the entire
lifetime of a product . Therefore it is sometimes also called product
life cycle. This covers everything from the initial commercial ideas
until the final DE installation or disassembling of the product after its
use
Each process model follows a particular life cycle in order to ensure
success in process of software development.
Three main phases
concept phase
implementation phase
maintenance phase
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9. Developing model
Linear sequential model
Waterfall model
Prototyping
Prototyping model
Rapid application development RAD model
Evolutionary software process
Spiral model
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10. SDLC--Water fall model
Water fall model was the first SDLC approach to be used
widely in SE to ensure the success of the project. The
water fall approaches the whole process of software
development is divided into separate phases.
It is also referred to as a linear sequential life cycle
model.
It is very simple to understand and use.
Each phase is must be completed before the next phase
can begin and there is no overlapping in the phases.
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11. Software devolvement life cycle
SDLC is step by process involved in the development of a
software product. The whole process is generally
classified into a set of steps and a specified into a set of
steps and specific operation will be carried out in each of
the steps.
There is no reverse action in this model
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12. Phases of Waterfall model SDLC
Planning
Requirement Analysis
Design
Development/coding
Testing
Maintenance
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13. Planning
To plan the total project and estimate the merits and demerits of the project
to the developed.
It involves estimation your attempt to determine how much money, how much
effort how many resource and how much time it will take to build a specific
software based system or project.
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14. analysis
To perform statistics and requirement gathering.
To know the behavior of the system to be developed.
To understand the specific requirement that must be achieved to build high
quality software.
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15. Design
Design begins with the requirement of the customer as a model.
It is a meaning engineering representation of something that is to be built.
Something like you would not attempt to build a house without blueprints.
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16. Development
The blue prints is transformed into actual coding by developing or writing
programs in some platform.
That is translating into a machine readable form.
Development includes– structure data, implementation , logic, processing and
produce desired output.
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17. testing
The testing process focuses on bugs. Software testing is critical element in
development to uncover errors in it.
It is referred as verification and validation.
verification – are we building the product right?
validation – are we building the right product?
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18. Maintenance
Software is expected to undergo change in new environment.
Support given after delivering the product to the customer in the original
environment.
Maintenance is accommodating the changes in the software in the external
environment.
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19. PROTOTYPING MODEL
The prototyping model begins with requirements
gathered.
Developer and customer meet and define the overall
objectives for the software identity what ever
requirements are know, and a quick design occurs.
(when a customer is not clear or the costumer will know the area of problem but not in the position of
view how he wanted the output or how the result should be like or customer cannot explain the new
product he wants . So customer did not well wise. Customer did not know anything how product should
look like or how to get result in this type the costumer and developer need to be sit and discuss the
requirement gathering and they will discuss the problems now whats developers do he will create a
small program to show ) o
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20. Continues……
The construction of this design is called a prototyping.
The prototyping is evaluated by the customer & used to redefined
requirement for the software to be designed.
Iteration occurs as the prototyping is tuned to satisfy the needs of the
customer.
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21. Rad Rapid application development
model
It is incremental software development process model emphasis an extremely
short development cycle.
The rad model is a high speed adaptation of the linear sequential model in
which rapid development is achieved by using component based
constructions.
IF requirement are well understood and scope is defined the RAD model
develops the fully functional system in very short period.
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23. Spiral Model
Spiral model is an evolutionary version of incremental prototyping.
Each iteration of the prototype representation as controlled and systematic
aspect in the cycle of spiral.
The spiral software development model is risk oriented
Spiral model software development model may be applicable to projects
where:
The projects requirement are very difficult.
Where new technologies are used.
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24. Evolutionary prototyping
The objectives of evolution prototyping is to deliver a working system to end
users. The development starts with those requirements which are best
understood.
An approach to system development where initial prototype is produced and
refined through a number of stages to the final system
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27. Fourth Generation Techniques
4GT encompasses a broad array of software tools that have one thing in
common: each enables the software engineer to specify some characteristic
of software at a high level, then the tool automatically generates source code
based on the developer's specification.
4GT paradigm focuses on the ability to specify software using specialized
language forms or a graphic notation that describes the problem to be solved
in terms that the customer can understand.
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28. Fourth Generation Techniques
A software development environment that supports the 4GT paradigm
includes some or all of the following tools:
nonprocedural languages for database query,
report generation,
data manipulation,
screen interaction and definition,
code generation;
4GT tools have high-level graphics capability; spreadsheet capability, and
automated generation of HTML and similar languages used for Web-site
creation using advanced software tools.
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29. Fourth Generation Techniques
4GT begins with a requirements gathering step.
For small applications, it may be possible to move directly from the
requirements gathering step to implementation using a nonprocedural fourth
generation language (4GL) or a model composed of a network of graphical
icons.
For larger efforts, it is necessary to develop a design strategy for the system,
even if a 4GL is to be used. The use of 4GT without design (for large projects)
will cause the difficulties (poor quality, poor maintainability, poor customer
acceptance)
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30. Fourth Generation Techniques
To transform a 4GT implementation into a product, the developer must
conduct thorough testing,
develop meaningful documentation, and perform all
other solution integration activities
The 4GT developed software must be built in a manner that enables
maintenance to be performed expeditiously.
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31. Concept of Software Project
Management
Software Project
A Software Project is the complete procedure of software development from
requirement gathering to testing and maintenance, carried out according to
the execution methodologies, in a specified period of time to achieve
intended software product.
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32. Need of software project management
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33. Software Management Activities
Software project management comprises of a number of
activities, which contains planning of project, deciding scope
of software product, estimation of cost in various terms,
scheduling of tasks and events, and resource management.
Project management activities may include:
•Project Planning
•Scope Management
•Project Estimation
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34. Project planning
Software project planning is task, which is performed
before the production of software actually starts. It is
there for the software production but involves no
concrete activity that has any direction connection with
software production; rather it is a set of multiple
processes, which facilitates software production.
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35. Project Scope management
It defines the scope of project; this includes all the activities, process need to
be done in order to make a deliverable software product. Scope management is
essential because it creates boundaries of the project by clearly defining what
would be done in the project and what would not be done. This makes project
to contain limited and quantifiable tasks, which can easily be documented and in
turn avoids cost and time overrun. During project scope management, it is
necessary to
Define the scope
Decide its verification and control
Divide the project into various smaller parts for ease of management.
Verify the scope
Control the scope by incorporating changes to the scope
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36. Project Estimation
For an effective management accurate estimation of various measures is
a must. With correct estimation managers can manage and control the
project more efficiently and effectively.
Project estimation may involve the following:
• Software size estimation Software size may be estimated either in
terms of KLOC (Kilo Line of Code) or by calculating number of
function points in the software. Lines of code depend upon coding
practices and Function points vary according to the user or software
requirement.
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37. Effort estimation
The managers estimate efforts in terms of personnel requirement
and man-hour required to produce the software. For effort estimation
software size should be known. This can either be derived by
managers’ experience, organization’s historical data or software size
can be converted into efforts by using some standard formulae.
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38. Time estimation
Once size and efforts are estimated, the time required to produce
the software can be estimated. Efforts required is segregated into
sub categories as per the requirement specifications and
interdependency of various components of software. Software tasks
are divided into smaller tasks, activities or events by Work
Breakthrough Structure (WBS). The tasks are scheduled on day-to-
day basis or in calendar months.
• The sum of time required to complete all tasks in hours or days is the
total time invested to complete the project.
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39. Cost estimation
This might be considered as the most
difficult of all because it depends on more elements than any of
the previous ones. For estimating project cost, it is required to consider
-
• Size of software
• Software quality
• Hardware
• Additional software or tools, licenses etc.
• Skilled personnel with task-specific skills
• Travel involved
• Communication
• Training and support
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40. Project Estimation Techniques
We discussed various parameters involving project estimation such as size,
effort, time and cost.
Decomposition Technique
This technique assumes the software as a product of various compositions.
There are two main models -
Line of Code Estimation is done on behalf of number of line of codes in the
software product.
Function Points Estimation is done on behalf of number of function points in
the software product.
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41. Empirical Estimation Technique
This technique uses empirically derived formulae to make estimation.
These formulae are based on LOC or FPs.
COCOMOCOCOMO stands for COnstructive COst MOdel, developed by Barry W.
Boehm. It divides the software product into three categories of software:
organic, semi-detached and embedded.
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42. Project Risk Management
Risk management involves all activities pertaining to identification, analyzing
and making provision for predictable and non-predictable risks in the project.
Risk may include the following:
Experienced staff leaving the project and new staff coming in.
Change in organizational management.
Requirement change or misinterpreting requirement.
Under-estimation of required time and resources.
Technological changes, environmental changes, business competition.
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43. Risk Management Process
There are following activities involved in risk management process:
Identification - Make note of all possible risks, which may occur in the
project.
Categorize - Categorize known risks into high, medium and low risk intensity
as per their possible impact on the project.
Manage - Analyze the probability of occurrence of risks at various phases.
Make plan to avoid or face risks. Attempt to minimize their side-effects.
Monitor - Closely monitor the potential risks and their early symptoms. Also
monitor the effects of steps taken to mitigate or avoid them.
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