V shape process model
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Software testing is an important phase of the software development process that evaluates the functionality and quality of a software application. It involves executing a program or system with the intent of finding errors. Some key points:
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This presentation primarily addresses, the strategy to be adopted in mobile app testing, the types of mobile app testing and the stages to be followed, before the application is set live.
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This document discusses information security as it relates to e-commerce applications. It covers several technical security attack methods that e-commerce applications can be vulnerable to, including financial frauds, spam, phishing, bots, DDoS attacks, brute force attacks, SQL injections, XSS, and Trojan horses. It also discusses vulnerability assessments, penetration testing stages and methods, and ISO/IEC 27001:2013 as an international standard for managing information security risks.
Software maintenance and evolution
What is software maintenance?
● Types of software maintenance
● Software maintenance process
● What is software evolution?
● Importance of software evolution
● Software evolution process
Software maintenance and evolution
What is software maintenance?
● Types of software maintenance
● Software maintenance process
● What is software evolution?
● Importance of software evolution
● Software evolution process
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Ariane 5 failure
Ariane 5 is a European heavy-lift launch vehicle that is part of the Ariane rocket family, an expendable launch system designed by the French government space agency Centre national d'études spatiales (CNES).
Ariane 5 failure (3)
Ariane 5 is a European heavy-lift launch vehicle that is part of the Ariane rocket family, an expendable launch system designed by the French government space agency Centre national d'études spatiales (CNES).
Ariane 5 failure (2)
Ariane 5 is a European heavy-lift launch vehicle that is part of the Ariane rocket family, an expendable launch system designed by the French government space agency Centre national d'études spatiales (CNES).
Ariane 5 failure
Ariane 5 is a European heavy-lift launch vehicle that is part of the Ariane rocket family, an expendable launch system designed by the French government space agency Centre national d'études spatiales (CNES).
The dhahram patriot missile failure
The Patriot missile system is a mobile air defense system designed to defend against aircraft, cruise missiles, and short-range ballistic missiles. It consists of radar units, engagement control stations, missile launchers, and communications support across multiple batteries. During the Gulf War, a Patriot battery in Dhahran, Saudi Arabia failed to intercept an incoming Iraqi Scud missile due to a software error that caused an inaccurate calculation of the system's clock time, allowing the Scud to hit a U.S. Army barracks and kill 28 soldiers.
The dhahram patriot missile failure (3)
The computer used to control the Patriot missile is based on a 1970s design and uses 24-bit arithmetic. The Patriot system tracks its target by measuring the time it takes for radar pulses to bounce back from them. Time is recorded by the system clock in tenths of a second, but is stored as an integer. To enable tracking calculations the time is converted to a 24-bit floating point number. Rounding errors in the time conversions cause shifts in the system's ``range gate", which is used to track the target.
The dhahram patriot missile failure (1)
The computer used to control the Patriot missile is based on a 1970s design and uses 24-bit arithmetic. The Patriot system tracks its target by measuring the time it takes for radar pulses to bounce back from them. Time is recorded by the system clock in tenths of a second, but is stored as an integer. To enable tracking calculations the time is converted to a 24-bit floating point number. Rounding errors in the time conversions cause shifts in the system's ``range gate", which is used to track the target.
Denver airport baggage handling system
The Denver Airport Baggage Handling System was originally supposed to open in 1993 but opened 16 months late and $200 million over budget due to underestimating its complexity and poor management. It is owned by the Colorado government and is the largest employer in the state. Its purpose is to detect bag jams, regulate volume, balance loads, count bags, and redirect bags. Its failure added $560 million to the airport's costs due to risks not being managed, leadership changes, and architectural issues compounding the problems.
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V shape process model
- 1. Software Engineering | SDLC V-Model
- 2. It means verification and validation . Just like WATER FALL model, The life cycle of the V model is a sequential path of the execution of the process. Each phase must be completed before the next phase begins. The testing of the product is planned in parallel with corresponding phase of development. Introduction
- 3. Objectives It should be used for small to medium size projects where requirements are clearly defined. It should be chosen when simple technical resources are available with needed technical expertise.
- 5. Principles of V-Model • Large to Small • Data/Process Integrity • Scalability • Cross Referencing • Tangible Documentation
- 6. Why preferred? When to use? • It is easy to manage due to the rigidity of the model. Each phase of V- Model has specific deliverables and a review process. • Proactive defect tracking – that is defects are found at early stage. • Where requirements are clearly defined and fixed. • The V-Model is used when ample technical resources are available with technical expertise.
- 7. Advantages • Simple and easy to use. • Testing activities like planning, test design happens well before coding. • This saves a lot of time. • Avoids the down word flow of the defects. • Works well for small projects where requirements are easily understood.
- 8. Disadvantages • Very rigid and cost flexible. • Software is developed during the implantation phase, so no early prototypes of the software are produced. •If any changes happens, then the test requirement documents has been updated.
- 9. Conclusion High confidence of the costumer is required for choosing the V-shaped model approach since no prototypes are produced. There is a very high risk involved in meeting expectation.
- 10. Any Questions
- 11. Thanks