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SDLC

            Black box testing is testing without knowledge of the internal workings of the item being tested. For example, when black box testing is applied to software engineering, the tester would only know the "legal" inputs and what the expected outputs should be, but not how the program actually arrives at those outputs.
             A software testing technique whereby explicit knowledge of the internal workings of the item being tested are used to select the test data. Unlike black box testing, white box testing uses specific knowledge of programming code to examine outputs. The test is accurate only if the tester knows what the program is supposed to do. He or she can then see if the program diverges from its intended goal.
             Black box testing maps a set of specific inputs to a set of expected outputs. An equivalence category is a collection of input sets. Two input sets belong to the same equivalence category if there is no reason to believe that if one works the other will not.
             Therefore testing one input set essentially tests the entire category. .
             Black Box Testing:.
             1. Equivalence Partitioning - Because exhaustive black box testing is not feasible, black box test cases must be chosen to find different faults if possible. We can assume that similar inputs will result in similar responses, allowing the grouping of inputs into equivalence classes. In equivalence partitioning, only one or a few test cases are chosen to represent the entire equivalence classes.
             Input data should be divided into equivalence classes based on consideration based of:-.
             - valid vs invalid input values.
             - valid vs invalid output values.
             - similarity and difference of input values.
             - similarity and difference of output values.
             - similarity and difference of expected processing.
             2. Boundary Value Analysis - Black box test cases must be chosen to maximize the chance of finding faults. Experience has shown that values at or near equivalence class boundaries are more likely to detect faults.


Essays Related to SDLC

1. ANALYSIS ON VASA CAPASIZES

... information systems project. Typically, the process of the development of information systems project can be divided into five different phases, which is known as the systems development life cycle or SDLC, including system planing and investigation, analysis, design, implementation, and maintenance and review. Similarly, the process of construction of ships also consists of these stages. We will talk about major pitfalls ... the Vasa Capasizes case, provide a brief introduction to objectives and tasks of each phase in SDLC and make an analogy to show how similar mistakes may occur in i...

  • Word Count: 903
  • Approx Pages: 4

2. System Development Life Cycle

... system will be constructed 1.2.4 Implement: Write the program & procedures; install 1.2.5 Test: test system 1.2.6 Maintain: Provide support & enhancements http://www.doc.mmu.ac.uk/online/SAD/T02/sdlc.htm 1.3.1 Problem Definition: Establish what the problem is 1.3.2 Feasibility Study: Establish scope & objectives; determine whether project is viable 1.3.3 Analysis: Define what constitutes a solution to the problem ... System 1.5.4 System Implementation: Write the program & procedures; Install & test system 1.5.5 System Operation: Make sure the system work well http://www.mckinnonsc.vic....

  • Word Count: 1215
  • Approx Pages: 5
  • Grade Level: High School

3. A Case Study of Technology Project

... was no longer hierarchical and the work was no longer handed down in a top down approach thus creating a need for a systematic way of managing people and tasks to function effectively. SDLC (Systems Development Life Cycle) The Life Cycle for this particular project did not exactly match the order of the phases as described in the Systems Development Life Cycle concept. Because ... resources while at the same time still provide timely and effective service to the business users of the IT systems and applications. System Concept Development Phase In this phase of SDLC, the business need h...

  • Word Count: 1364
  • Approx Pages: 5
  • Grade Level: Undergraduate

4. A Case Study Of A Technology Project

... at the same time still provide timely and effective service to the business users of the IT systems and applications. Analyzing the System Concept Development Phase In this phase of SDLC, the business need has been approved and the approaches for accomplishing the concept are reviewed for feasibility and appropriateness. Several approaches were considered for tackling the problem in the IT ... , the IT staff were trained on how to use it and how work should flow through the organization. Conclusion The project as a whole went through a couple of cycles of the SDLC due to different implem...

  • Word Count: 1316
  • Approx Pages: 5
  • Has Bibliography
  • Grade Level: Undergraduate

5. An approach to systems development that would minimise the c

... discussed in brief, followed by more detailed information on Joint Application Design (JAD), Prototyping and Rapid Application Development (RAD). The Waterfall model formally also known as System Development Life Cycle (SDLC) Was much beloved in the early days of software engineering and still dominates some government procurement projects' (Neilsen, 2001). Waterfall model adopted from (www.cogs.susx.ac.uk/.../se/Slides ... jointly in real-time to develop systems. RAD is not a single methodology but is instead a general strategy of developing information systems. The same phases that ar...

  • Word Count: 3063
  • Approx Pages: 12
  • Grade Level: Undergraduate

6. Enterprise-Level Business System

... business system there are quite a few key areas that should be reviewed. Often when looking at early stages of the system usually in regards to the System Development Life Cycle (SDLC) it can be very inefficient and costly if not done correctly. In looking to address this you can make sure to have careful planning during the very early stages of ... ...

  • Word Count: 1065
  • Approx Pages: 4
  • Has Bibliography
  • Grade Level: Undergraduate

7. Proposed Automated Order Entry System

... also suggests that automating the order entry system could impact sales favorably. Team B has been organized to research the market for a favorable automated order entry system and to use the SDLC process for the integration of that process within the company's infrastructure. Mission Company XYZ is determined to execute a comprehensive business plan to maximize long-term results. In a complex macroeconomic environment ... ...

  • Word Count: 2432
  • Approx Pages: 10
  • Has Bibliography
  • Grade Level: Undergraduate

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