• It focuses on those aspects which are visible to the user rather than the detailed plan. • It helps to construct a prototype.

RAD generally incorporates short development cycles - users see the RAD product quickly. RAD involves user participation thereby increasing chances of early user community acceptance. RAD realizes an overall reduction in project risk.

Different life cycle models may map the basic development activities to phases in different ways. • 3 Why do we require a life cycle model? The primary advantage is that it encourages development of software in a systematic and disciplined manner. When a software product is developed by a team, it is necessary to have a precise understanding among the team members as to – when to do what.

Concurrent engineering. Since concurrent engineering practices decrease the time spent in the design and development. What Are the Advantages & Disadvantages.

• When the users are satisfied with the developed prototype then the system is developed on the basis of final prototype. Advantages of Prototyping Model • Prototype model need not know the detailed input, output, processes, adaptability of operating system and full machine interaction. • In the development process of this model users are actively involved. • The development process is the best platform to understand the system by the user.

The OSI model is too complex. The gap between the concrete use (implementation) and the model is sometimes significant. Indeed, few programs can use or wrongly use the 7 layers of the model: the session and presentation layers are hardly used and on contrary the data link and network layers are often split into several sub-layers, since they are pretty complex. The OSI model is in fact too complex to be effectively and properly implemented.

 Planning: Multiple software team works in parallel on different functions.  Process modeling: 3 modeling - Business modeling - Data modeling - process modeling Construction: Code generation  Deployment: Is faster because of reusable components. • 13 RAD model Advantages of RAD model 1. Can be used for projects which can be modularized.

At the implementation level, TCP/IP is much more optimized and effective. OSI model is not adapted at all to telecommunication applications on computer. Some choices are in disagreement with the way computers and software communicate. The standard actually uses 'system interruptions' to report events, and with high level programming languages, that is not very realizable.

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In this article, we will explore the different types of SDLC models and the advantages and disadvantages of each one and when to use them. You can think of SDLC models as tools that you can use to better deliver your software project. Therefore, knowing and understanding each model and when to use it, the advantages and disadvantages of each one are important to know which one is suitable for the project context. Types of Software developing life cycles (SDLC) • • V-Shaped Model • Model • Method () • Method • Waterfall Model Description The is a linear sequential flow. In which progress is seen as flowing steadily downwards (like a waterfall) through the phases of software implementation.

• Easier to manage risk because risky pieces are identified and handled during it’d iteration. Disadvantages of Incremental model: • Needs good planning and design. • Needs a clear and complete definition of the whole system before it can be broken down and built incrementally. • Total cost is higher than. When to use the Incremental model: • This model can be used when the requirements of the complete system are clearly defined and understood. • Major requirements must be defined; however, some details can evolve with time.

What Is Sequential Engineering? The Advantages and after that Disadvantages of CAD.CAM. Concurrent executive conveniences disadvantages?

Australia taxes rates can be more favourable you'll have access to a wider capital and after that skills base. Disadvantages of a company comprise of that. Advantages and after that disadvantages of concurrent player in software executive. K.Goseva 2006 CS 230 Introduction so that you can Software Engineering Slide 5 Waterfall Model. Waterfall Model (contd) • Advantages. • Concurrent.

Due to the complexity of the model, the first implementations were pretty heavy and slow. Conversely, the first implementation of TCP/IP in the Unix system of the Berkeley University (BSD) was free and relatively effective. Historically, people thus had a natural tendency to use TCP/IP. Advantages 1. Estimates (i.e.

• It is good for large and critical projects. • It gives strong approval and documentation control. • In spiral model, the software is produced early in the life cycle process. Disadvantages of Spiral Model • It can be costly to develop a software model. • It is not used for small projects. The concurrent development model • The concurrent development model is called as concurrent model.

• Very difficult to go back to any stage after it finished. • A little flexibility and adjusting scope is difficult and expensive. • Costly and required more time, in addition to the detailed plan. V-Shaped Model Description It is an extension of the waterfall model, Instead of moving down in a linear way, the process steps are bent upwards after the implementation and coding phase, to form the typical V shape. The major difference between the V-shaped model and waterfall model is the early test planning in the V-shaped model.

Computer-aided-design software to prepare a design which your puppy is going to manufacture using the running machine connected to the computer behind the guy. 7 The advantages of CAM systems are- Products can be made very accurately and after that consistently. Advantages and Disadvantages of the the Internet (Essay 1). Web web site is protected with a recognizable security signature.

Then he started building it and in the first iteration the first module of the application or product is totally ready and can be demoed to the customers. Likewise in the second iteration the other module is ready and integrated with the first module. Similarly, in the third iteration the whole product is ready and integrated. Hence, the product got ready step by step. Diagram of Incremental model: Advantages of Incremental model: • Generates working software quickly and early during the software life cycle. • This model is more flexible – less costly to change scope and requirements. • It is easier to test and debug during a smaller iteration.

• Due to extensive use of prototypes with each being as close to the final product as possible, the customer gets to see the product early on in the development and is thus able to provide his/her valuable feedback and suggest changes according to his requirements. • Spiral model is most suited for the development of new, customized or high-risk projects. Disadvantages • The spiral model is an unnecessarily complicated design methodology especially for projects in which the software requirement specifications are clear and definite. It is also not feasible for many low-risk projects. • This model requires that the developers possess a high-level skill-set which is a necessity for reviewing the prototype in each phase and loop of the development.

The same as above, except that we have access to a CASE tool that generates program code automatically. A general purpose product, but with a very strong marketing team who understand and articulate the overall customer requirements very well 4. A product that is made of a number of features that become available sequentially and incrementally. Hi Siraj, Thank you for your comment, this will depend on the requirements and also project scope, for example, your requirements can be to implement a full inventory system, but the project scope and time is limited to specific part of these requirements.

Fast responses are required from both the parties. Not useful for all types of systems i.e. If it is not possible to modularize.

Basically, it breaks down web development into three phases, each one based on the preceding one. The first phase is a static prototype that consists mainly of HTML pages. In the second phase, the screens are programmed and fully functional using a simulated services layer. In the third phase, the services are implemented The usage • This process can be used with any software developing life cycle model. While this shall be chosen when you are developing a system has user interactions. So, if the system does not have user interactions, such as a system does some calculations shall not have prototypes. Advantages and Disadvantages Advantages Disadvantages • Reduced time and costs, but this can be a disadvantage if the developer loses time in developing the prototypes.

Disadvantages 1. Highly customized limiting re-usability 2. Applied differently for each application 3. Risk of not meeting budget or schedule 4. Risk of not meeting budget or schedule. Rapid application development is a software development methodology, which involves iterative development and the construction of prototypes. It is a merger of various structured techniques, especially the data driven Information Engineering with prototyping techniques to accelerate software systems development Advantages of the RAD methodology:.

• Since this model involves loops or stages, the cost of implementation is high.

This development approach does not define the process to go back to the previous phase to handle changes in requirements. Advantages of Waterfall Model: • Waterfall model is very simple and easy to understand and use a method that is why it is really beneficial for the beginner or novice developer • It is easy to manage, because of the rigidity of the model.

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• It is a combination of prototype and sequential model or waterfall model. • In one iteration all activities are done, for large project's the output is small.

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Concurrency, in computing, refers to when multiple path of execution (threads or processes) are running at the same time. This is a very loosely defined term and may refer to multiple things:.

• Needs special skills for the team. Cn u hlp me pplz in these questions Q1. Which SDLC will be most suitable for each of the following scenarios and why? The product is a custom made product for a specific customer, who is always available to give feedback.

Separate RAD teams can work on different modules. Overall time requirement is very less. Problems or disadvantages 1. Large manpower required to create large number of RAD teams. Developers and customers must be committed to this type of model.

Requirement is fixed and proceed in linear manner. • 6 Incremental Process Model analysis design code test System/information engineering analysis design code test analysis design code test analysis design code test increment 2 increment 3 increment 4 increment 1 delivery of 1st increment delivery of 2nd increment delivery of 3rd increment delivery of 4th increment calendar time • 7 Incremental Process Model Combines elements of the waterfall model applied in an iterative fashion. Incremental applies linear sequences as the calendar time progress. Limited software functionalities and expands functionalities in later software release. • 8 Increment Model  Each linear sequence produces a deliverable ‘increment’ of the software  Eg. Word processing software  First increment is often a core product  Basic requirements are addressed, but many supplementary remains undelivered.

• It is used for generating the software projects. • In spiral model, an alternate solution is provided if the risk is found in the risk analysis, then alternate solutions are suggested and implemented.

The Prototyping model • Prototype is defined as first or preliminary form using which other forms are copied or derived. • Prototype model is a set of general objectives for software. • It does not identify the requirements like detailed input, output. • It is software working model of limited functionality. • In this model, working programs are quickly produced. The different phases of Prototyping model are: 1. Communication In this phase, developer and customer meet and discuss the overall objectives of the software.

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 Customers evaluate this core product and the next increment is planned based on suggestions and next set of features  The plan addresses the modification of core product and delivery of additional features and functionalities.  Process is repeated until complete product is produced. • 9 Increment Model Useful when  Staff is unavailable for complete implementation and deadline is tight  If core product is well received, additional staff can implement next increment  Increment can be planned to manage technical risks  Partial functionalities can be delivered to end – user without inordinate delay. • 10 RAD Model Communication team #3 60 - 90 days Planning Modeling Construction Testing Modeling Construction team #1 team #2 Modeling Construction • 11 RAD Model Rapid Application Development Model  It is incremental software development process. A short development cycle  It is “high speed” adaptation of linear sequential model.  Done by component based construction.  Requirements should be well understood and scope must be limited.

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Spiral Model Phases Activities performed during phase Planning • It includes estimating the cost, schedule and resources for the iteration. It also involves understanding the system requirements for continuous communication between the system analyst and the customer Risk Analysis • Identification of potential risk is done while risk mitigation strategy is planned and finalized Engineering • It includes testing, coding and deploying software at the customer site Evaluation • Evaluation of software by the customer. Also, includes identifying and monitoring risks such as schedule slippage and cost overrun When to use Spiral Methodology?