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by Dinesh Thakur Category: Software Engineering

Software Design: It is the first step in moving from problem domain to solution domain. The purpose of the design phase is to plan a solution of the problem specified by the requirements document. Starting with what is needed, design takes towards how to satisfy the needs.

by Dinesh Thakur Category: Software Engineering

In control flow based and data flow based testing the focus was on which paths to execute during testing. Mutation testing does not take a path-based approach. Instead it takes the program and creates many mutants of it by making simple changes to the program.

by Dinesh Thakur Category: Software Engineering

Software engineering shares common interest with other engineering disciplines. Like other engineering domains where a given problem (for example, building a bridge) can be solved by following a series of interrelated steps, the software development process also comprises a number of steps or phases. The main objective of software engineering is to develop methods for large systems, which help developers obtaining high-quality software in minimum time and at low cost. Therefore, it is essential to perform software development in phases. This phased development of software is often referred to as the software development life cycle (SDLC) or software life cycle.

by Dinesh Thakur Category: Software Engineering

Over the last 50 years there has been revolutionary advancement in the field of technology, leading to improvements in hardware performance and profound changes in computing architectures. This advancement has led to the production of complex computer-based systems that are capable of providing information in a wide variety of formats. The increase in computer power has made unrealistic computer applications a feasible proposition, marking the genesis of an era where software products are far more complex as compared to their predecessors. By using software engineering practices, these complex systems can be developed in a systematic and efficient manner.

by Dinesh Thakur Category: Software Engineering

Omission: - is a common error in requirements. In this type of error, some user requirements are simply not included in the SRS The omitted requirement may be related to the behavior of the system, its performance, constraints or any other factor.

by Dinesh Thakur Category: Software Engineering

In the software development process, requirement phase is the first software engineering activity. This phase is a user-dominated phase and translates the ideas or views into a requirements document. Note that defining and documenting the user requirements in a concise and unambiguous manner is the first major step to achieve a high-quality product.

by Dinesh Thakur Category: Software Engineering

To perform testing in a planned and systematic manner, software testing strategy is developed. A testing strategy is used to identify the levels of testing which are to be applied along with the methods, techniques, and tools to be used during testing. This strategy also decides test cases, test specifications, test case decisions, and puts them together for execution.

Developing a test strategy, which efficiently meets the requirements of an organization, is critical to the success of software development in that organization. Therefore, a software testing strategy should contain complete information about the procedure to perform testing and the purpose and requirements of testing.

The choice of software testing strategy is highly dependent on the nature of the developed software. For example, if the software is highly data intensive then a strategy that checks structures and values properly to ensure that all inputs given to the software are correct and complete should be developed. Similarly, if it is transaction intensive then the strategy should be such that it is able to check the flow of all the transactions. The design and architecture of the software are also useful in choosing testing strategy. A number of software testing strategies are developed in the testing process. All these strategies provide the tester a template, which is used for testing. Generally, all testing strategies have following characteristics.

  1. Testing proceeds in an outward manner. It starts from testing the individual units, progresses to integrating these units, and finally, moves to system testing.
  2. Testing techniques used during different phases of software development are different.
  3. Testing is conducted by the software developer and by an ITG.
  4. Testing and debugging should not be used synonymously. However, any testing strategy must accommodate debugging with itself.

Types of Software Testing Strategies

There are different types of software testing strategies, which are selected by the testers depending upon the nature and size of the software. The commonly used software testing strategies are listed below.

                     Types of Software Testing Strategy

  1. Analytic testing strategy: This uses formal and informal techniques to access and prioritize risks that arise during software testing. It takes a complete overview of requirements, design, and implementation of objects to determine the motive of testing. In addition, it gathers complete information about the software, targets to be achieved, and the data required for testing the software.
  2. Model-based testing strategy: This strategy tests the functionality of the software according to the real world scenario (like software functioning in an organization). It recognizes the domain of data and selects suitable test cases according to the probability of errors in that domain.
  3. Methodical testing strategy: It tests the functions and status of software according to the checklist, which is based on user requirements. This strategy is also used to test the functionality, reliability, usability, and performance of the software.
  4. Process-oriented testing strategy: It tests the software according to already existing standards such as the IEEE standards. In addition, it checks the functionality of the software by using automated testing tools.
  5. Dynamic testing strategy: This tests the software after having a collective decision of the testing team. Along with testing, this strategy provides information about the software such as test cases used for testing the errors present in it.
  6. Philosophical testing strategy: It tests the software assuming that any component of the software can stop functioning anytime. It takes help from software developers, users and systems analysts to test the software.

A testing strategy should be developed with the intent to provide the most effective and efficient way of testing the software. While developing a testing strategy, some questions arise such as: when and what type of testing is to be done? What are the objectives of testing? Who is responsible for performing testing? What outputs are produced as a result of testing? The inputs that should be available while developing a testing strategy are listed below.

  1. Type of development project
  2. Complete information about the hardware and software components that are required to develop the software
  3. Risks involved
  4. Description of the resources that are required for testing
  5. Description of all testing methods that are required to test various phases of SDLC
  6. Details of all the attributes that the software is unable to provide. For example, software cannot describe its own limitations.

The output produced by the software testing strategy includes a detailed document, which indicates the entire test plan including all test cases used during the testing phase. A testing strategy also specifies a list of testing issues that need to be resolved.

An efficient software testing strategy includes two types of tests, namely, low-level tests and high-level tests. Low-level tests ensure correct implementation of small part of the source code and high-level tests ensure that major software functions are validated according to user requirements. A testing strategy sets certain milestones for the software such as final date for completion of testing and the date of delivering the software. These milestones are important when there is limited time to meet the deadline.

In spite of these advantages, there are certain issues that need to be addressed for successful implementation of software testing strategy. These issues are discussed here.

  1. In addition to detecting errors, a good testing strategy should also assess portability and usability of the software.
  2. It should use quantifiable manner to specify software requirements such as outputs expected from software, test effectiveness, and mean time to failure which should be clearly stated in the test plan.
  3. It should improve testing method continuously to make it more effective.
  4. Test plans that support rapid cycle testing should be developed. The feedback from rapid cycle testing can be used to control the corresponding strategies.
  5. It should develop robust software, which is able to test itself using debugging techniques.
  6. It should conduct formal technical reviews to evaluate the test cases and test strategy. The formal technical reviews can detect errors and inconsistencies present in the testing process.

by Dinesh Thakur Category: Software Engineering

As soon as the first iteration of architectural design is complete, component-level design takes place. The objective of this design is to transform the design model into functional software. To achieve this objective, the component-level design represents -the internal data structures and processing details of all the software components (defined during architectural design) at an abstraction level, closer to the actual code. In addition, it specifies an interface that may be used to access the functionality of all the software components.

by Dinesh Thakur Category: Software Engineering

Once measures are collected they are converted into metrics for use. IEEE defines metric as 'a quantitative measure of the degree to which a system, component, or process possesses a given attribute.' The goal of software metrics is to identify and control essential parameters that affect software development. Other objectives of using software metrics are listed below.

by Dinesh Thakur Category: Software Engineering

The aim of testing is often to demonstrate that a program works by showing that it has no errors. This is the opposite of what testing should be viewed as.


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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to contact us.

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