Structured systems analysis and design

structure systems analysis and objectiveStructured Systems abbreviation and Design (SSAD)With this particular methodology, a package development venture is divided into s ragtimees, steps, tasks and modules/ components.Objectives of SSAD ITC Infotech India Ltd.Structured Systems Analysis and Design (SSAD) was developed with specific objectives To warrant that a excogitate could lucratively persist should a expiration in staff number without any adverse consequences on the projectTo improve communication betwixt only participants in the project so that an effective construction is in placeTo develop a better of class systemsTo improve the manner in which projects are controlled and directedTo allow for the efficient utilisation of both experienced and inexperienced staffTo allow for projects to be supported by computer- aided software engineering applicationsHow SSAD worksSSAD is a waterfall approach whereby there are a series of events which occur in sequential order, each step leading from the last. in that respect are a total of volt steps and they are as followsFeasibility line of business This is a study that will determine if the project is actually possible to undertake and whether it is cost effective or not.Requirements analysis Identifying the needs of the businessRequirements judicial admission The requirements (functional and non- functional) are cl archaeozoic and unambiguously identified and responsibilityd.Logical system specification The skilful systems options are created and in addition the crystalline design of the system, including upgrade and enquiry designs.Physical design The logical system specification and technical specification is whence used to design a physical database and set of program specifications.Advantages of SSADTimelines as mentioned before, SSAD feces be used to improve the way a project is controlled and directed. This is due to the fact that it allows one to end the project well which is essential to deliver the product on time.Improvement of productivity By load-bearing(a) on-time delivery, meeting business needs, ensuring better quality, using human resources effectively as well as evading bureaucracy, SSAD improves global productivity of the project.Better quality Decreases the error rate of information systems by telling a certain take aim of class in the launch and constantly checking the system.Effective use of skills It does not require any fussy skills and can easily be taught to the staff. It usually makes use of diagramming and modelling tools.It can respond to changes in the business environment Business requirements and objectives are taken into consideration while the project is being developed. This creates the hypothesis to adjust the planning of the project to the actual requirements of the business.Usability Special emphasis is put on the analysis of the exploiter requirements. Concurrently, the system model is constructed and a wide-ranging demand analy sis is conducted.Cuts costs Due to the fact that SSAD separates logical and physical systems design, the system does not have to be executed again with new hardware or software.Disadvantages of SSADSSAD puts prominence on the analysis of a system and its documentation. This paves the way for over-analysing, which in turn can be very time consuming and puts strain on expense.Available from http//www.scribd.com/doc/19681828/SSAD Date accessed November 25th, 2009Object Oriented Analysis and Design This is a software development approach that puts great prominence on logical solutions base on objects (individual components of a system). It takes a bottom- top developmental approach and makes use of UML (Unified Modelling Language).Objectives of OOAD JS Consulting Group Inc. (2000-2009)To study already existing objects to see if they can in fact be reused or adapted for newer uses.To identify new or modified objects that will be pooled with existing objects into a useful business compu ter science application.Available from http//www.jscgroup.com/object-oriented-analysis-and-design.html Date accessed October 25th, 2009How OOAD works Kenneth Pefkaros, International Journal of Business research, March 2008. In OOAD, the developers capture required flesh out as a system of objects which encapsulate both data and processes. It uses three elemental techniques to for analysis operational modelling The analyst uses activity diagrams and use case diagrams to give designers a clearer picture of how the system works. morphological modelling The analyst uses class diagrams to group related objects.Behavioural diagrams The analyst uses sequence diagrams, communication and state diagrams, to give a basic description of how objects respond to the environment, as well as, how they change state during transactions.These techniques then provide the designers with sufficient documented information which they will use in the creating of the system.Available from http//findarticles. com/p/articles/mi_6773/is_2_8/ai_n31126769/pg_4/?tag=contentcol1Date accessed October 25th, 2009Advantages of OOADIt significantly simplifies the development of the systemIt enables the consistency of objects which increases the understanding of the designDecomposing the system into individual objects makes it easier and more(prenominal) manageable for the analyst to work with.When working with objects, they can be reused and modified which cuts costs and save time.Disadvantages of OOADThere is more emphasis on codesThere isnt much emphasis on team workThe early designs for the system may be too simplified to be adequateIt isnt easy to establish all the necessary classes and objects needed for the system