Departamento de Informática Universidad de Valladolid Campus de Segovia TOPIC 6: INTRODUCTION TO SOFTWARE ENGINEERING
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1 Departamento de Informática Universidad de Valladolid Campus de Segovia TOPIC 6: INTRODUCTION TO SOFTWARE ENGINEERING
2 THE SOFTWARE FEATURES Software is developed not manufacture. Software does not break when it is used but spoiled due to changes. Nowadays, software is developed without reuse.
3 REAL AND IDEAL SOFTWARE FAILURE CURVE RATE OF FAILURES CHANGE INCREASE OF RATE OF FAILURE DUE TO CHANGES REAL CURVA IDEAL CURVA TIME
4 CHANGE IMPACT ACCORDING TO THE PHASE INVOLVED COST 1x 1,5-6x x DEFINITION DEVELOPMENT AFTER DELIVERING
5 The sooner you write code the later you will finish it.
6 SOFTWARE ENGINEERING. DEFINITION It is the most suitable framework to guarantee the quality of software. Consists in a process of development and some models and tools.
7 THE PROCESS The software development is an iterative learning process In order to describe the differents steps that define a process, S.I. provides: Models: describe how to develop software (a process for the creation of software) Tools: give us an automatic or semiautomatic approach to the process and methods.
8 GENERAL DEVELOPMENT PHASES Definition phase (What do I have to do?). (problem definition=user-analyst communication). Development phase (How do I have to do it?). Maintenance phase (Changes). Correctness Adaptation Improveness Prevention
9 Waterfall model. MODELS Prototypes. Evolutive models. The spiral model.
10 WATERFALL MODEL The waterfall model is a sequential software development model. In this model development is seen as flowing steadily downwards (like a waterfall) through the phases of requirements analysis, design, implementation, testing, (validation), integration, and maintenance.
11 WATER FALL MODEL PLANNING ANAYISIS DESIGN ENCODING TESTING MAINTENANCE
12 THE WATERFALL MODEL. PLANNING User-analyst Comunication. Fisrt approach to software requirements. Assessment of human and technic resources.
13 THE WATERFALL MODEL. ANALYSIS Analysis phase consists in: Describing the application software functionality. Integrating the modules that makes up the application. Determining how will be the testing phase. As a result of this phase a complete requirement specification is achieved.
14 THE WATERFALL MODEL. DESIGN Design phase consists in: Describing the software application arquitecture (relationships among the differents parts that makes up the application). These parts are delivered among the programmers. Each part before mentioned is more detailed described using an algorithmic language.
15 THE WATERFALL MODEL. IMPLEMENTATION Encoding the algorithms by means of an specific programming language
16 THE WATERFALL MODEL. TESTING The testing phase consists in searching errors in order to debug them. In this regards: each module and their conection among them are tested Finally the application, as a whole, is tested.
17 THE WATERFALL MODEL. MAINTENANCE The final user and maintenance documentation is achieved. New detected errors are debbuged. The application is surveillanced in order to consider future possible modifications
18 SUMMARIZING ANALYSIS Understand The problem DESIGN Define architecture IMPLEMENTATION encoding The program TESTING Searching and debbuging errors MAINTENANCE Surveillance
19 INCONVENIENTS OF THIS MODEL Software Projects unfrequently present a sequential evolution. Furthermore: usually all the requirements are not explicit described at the beginning as it is required for this model. And the user has to be patient since the complete application only will be available at the final stages.
20 PROTOTYPES Recollect those requirements that describe The most important goals -Quick design -build the prototype LISTEN TO USER ITERATIVE PROCESS BUILD AND REVIEW THE PROTOTYPE PROTOTYPE USER ASSESSMENT More detailed description of the requirements by means of the User Assessment of the prototype
21 INCONVENIENTS OF THIS MODEL User may think that the built prototype is a finished software application. Sometimes the chosen development tools may not be suitable.
22 THE SUCCESS KEY OF THIS MODEL CONSIST IN DEFINING AT THE BEGINING THE GAME RULES, THAT MEANS, STABLISIHING A GOOD USER- PROGRAMMER COMMUNICATION.
23 EVOLUTIVE MODELS. THE SPIRAL MODEL It was proposed by Boehm. [BOE 88]* The spiral models is: Iterative like prototypes. Presents some controled and sistematic aspects like waterfall model. First iterationsprimeras: prototype Last iterations: more complete version *Boehm, B. A Spiral Model for Software Development and Enhancement, Computer, vol. 21, nº 5 Mayo 1988.
24 THE SPIRAL MODEL PLANNING RISK ANALYSIS COMMUNICATION WITH THE USERS USER ASSESSMENT BUILD AND ADAPTATION ENGINEERING 1. CONCEPT DEVELOPMENT 2. DEVELOPMENT OF NEW PRODUCTS 3. IMPROVING THE PRODUCTS 4. PRODUCT MAINTENANCE
25 SOFTWARE QUALITY. RELIABILITY AND CORRECTNESS SOFTWARE QUALITY: that means a correct and reliable implementation.
26 CORRECTNESS An algorithm is partially correct if given an input, it is possible to guarantee that the algorithm will reach an output, satisfing both set of data the algorithm specification, once the algorithm finishs but without making sure this last premise. An algorithm is completely correct if it is partially correct and beside it is also possible to guarantee that this one finishs.
27 SOFTWARE TESTING Software Testing consist in: Checking the proper application operation regarding only a few check data sets. The testing process does not avoid the presence of more errors.
28 SOFTWARE RELIABILITY Software Reliability is the probability of failure-free software operation for a specified period of time in a specified environment. Software Reliability differs from hardware reliability in that it reflects the design perfection, rather than manufacturing perfection. The high complexity of software is the major contributing factor of Software Reliability problems.
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