Software Development Life Cycle
Software development approach and has a value proposition that includes faster turnaround times, trained pool of engineers with decent exposure to processes and best practices followed for the entire SDLC.
We have exposure on the following SDLC models :
- Waterfall
- V-Shaped
- Structured Evolutionary Prototyping Model
- Incremental
- Spiral
- Agile
A brief description of the various models mentioned above is given below. Along with the description, we have mentioned the strengths and discussed when a particular model is suited to you:
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Software Quality Assurance is a good practice that every large scale business should employ. IT related businesses have never hesitated to use SQA to ensure that the application they will release for their users or sell to their customers will live up to their expectations.
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On the other hand, there are companies that has opted to forgo with the usage of SQA and relied on application testers just to make sure the application will never have internal errors. The SDLC on the other hand, will ensure the development of the application will work as planned.
Like other development plans, there are issues why developers and companies do not use SQA.
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Purpose
To describe the scope, approach, resources, and schedule of the testing activities. To identify the items being tested, the features to be tested, the testing tasks to be performed, the personnel responsible for each task, and the risks associated with this plan.
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Testing Levels and Types
There are basically three levels of testing i.e. Unit Testing, Integration Testing and System Testing. Various types of testing come under these levels.
Unit Testing:
To verify a single program or a section of a single program
Integration Testing:
To verify interaction between system components
Prerequisite: unit testing completed on all components that compose a system
System Testing:
To verify and validate behaviors of the entire system against the original system objectives
Software testing is a process that identifies the correctness, completeness, and quality of
software.
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Following are the most common software errors that aid you in software testing. This helps you
to identify errors systematically and increases the efficiency and productivity of software testing.
Types of errors with examples
• User Interface Errors: Missing/Wrong Functions, Doesn’t do what the user expects, Missing
information, Misleading, Confusing information, Wrong content in Help text, Inappropriate error
messages. Performance issues – Poor responsiveness, Can’t redirect output, Inappropriate use of
key board
• Error Handling: Inadequate – protection against corrupted data, tests of user input, version
control; Ignores – overflow, data comparison, Error recovery – aborting errors, recovery from
hardware problems.
• Boundary related errors: Boundaries in loop, space, time, memory, mishandling of cases
outside boundary.
• Calculation errors: Bad Logic, Bad Arithmetic, Outdated constants, Calculation errors,
Incorrect conversion from one data representation to another, Wrong formula, Incorrect
approximation.

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Verification and Validation.
- Testing is part of verification and validation.
- Verification: Are we building the product right?
- Validation Are we building the right product?
- V&V activities include a wide range of the SQA activities.
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Some Important terminologies
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