Sorry, this document isn’t available for viewing at this time. In the meantime, you can download the document by clicking the ‘Download’ button above. Engenharia De Software (Em Portuguese do Brasil) [Ian Sommerville] on Desde a primeira edição deste livro, publicada há mais de vinte anos. Title: Engenharia software ian sommerville, Author: StarTVNet Floripa, Name: Engenharia software ian sommerville, Livro do curso ADM sistemas (Prof.

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The requirements themselves are the descriptions of the system services and constraints that are generated during the requirements engineering process.

There shall be a standard user interface to all databases which shall be based on the Z The drawback of the waterfall model is the difficulty of accommodating change after the process is underway. Based on systematic reuse where systems are integrated from existing components or COTS Commercial-off-the-shelf systems.

Requirements may be defined operationally livro engenharia de software ian sommerville a language like a programming language but with more flexibility of expression. PDL may not be sufficiently expressive to express the system functionality livro engenharia de software ian sommerville an understandable way.

Classification helps us understand the different types of CASE tools and their support for process activities. Although there has been a demarcation between development and evolution maintenance this is increasingly irrelevant as fewer and fewer systems are completely new. The system shall provide appropriate viewers for the user to read documents in the document store.

User requirements are prioritised and the highest priority requirements are included in early increments. As requirements change through changing business circumstances, the software that supports the business must also evolve and change. Rather than deliver the system as a single delivery, the development and delivery livro engenharia de software ian sommerville broken down into increments with each increment delivering part of the required functionality.


Most systems must operate with other systems and the operating interfaces must be specified as part of the requirements. Process requirements may also be specified mandating a particular CASE system, programming language or development method. Use shall for mandatory requirements, should for desirable requirements.

In principle, requirements should state what the system should do and the design should describe how it does this. Sovtware approach to development based on the development and delivery of very small increments of functionality. Define system properties and constraints e. It may range from a high-level abstract statement of a service or of a system constraint to a detailed mathematical functional specification.

Engenharia de Software – Cap 5 – Apresentaçao

It presents a description of a process from some particular perspective. Software processes are sngenharia activities involved in producing and evolving a software system. Non-functional requirements may be very difficult to state precisely and livro engenharia de software ian sommerville requirements may be difficult to verify. System testing involves executing the system with test cases that are derived from the specification of the real data to be processed by the system.

May be new functional requirements, constraints on existing requirements or define egenharia computations. Case technology has led to significant improvements in the software process though not the livro engenharia de software ian sommerville of softwafe improvements that were once predicted. The process of establishing the services that the customer requires from a system and the constraints under which it operates and is developed.

Computer-aided software engineering CASE is software to support software development and evolution processes. To describe outline process models for requirements engineering, software development, testing and evolution.

Engenharia de Software – Cap 3 – Apresentaçao

Use language in a consistent way. It is Sommegville a design document. Based on the transformation of a mathematical specification through different representations to an executable program.

Non-functional requirements may be more critical than functional requirements. Because of copyright restrictions, some documents must be deleted immediately on arrival.


Engenharia de Software – Cap 5 – Apresentaçao – Apresentacao do livro de

Programmers carry out some program testing to discover faults in the engenhaia and remove these faults in the debugging process. System dd ALWAYS evolve in the course of a project so process iteration where earlier stages are reworked is always part of the process for large systems.

If these are not met, the system is useless. Once the development of an increment is started, the requirements are livro engenharia de software ian sommerville though requirements for later increments can continue to evolve. The user shall be able to search either all of the initial set of databases or select a subset from it. A software process model is an abstract representation of a process. Functional user requirements may be high-level statements of what the system should do but softwzre system requirements should describe engenharis system services in detail.

This removes some of the problems resulting from ambiguity and flexibility and imposes a degree of uniformity on a specification. Requirements set out what the system should do and define constraints on its operation and implementation. Verification and livro engenharia de software ian sommerville is intended to show that a system conforms to its specification and meets the requirements of the system customer. The requirement may be taken as a design specification rather than a model to help understand the system.

No fixed phases such as specification or design – loops in the spiral are chosen depending on what is required.