Question

Write briefly on prototyping and physibility study

Answer 1

Theprototyping modelis applied when detailedinformationrelated to input andoutput requirements of the system is not available. In this model, it is assumed that all the requirements may not be known at the start of the development of the system. It is usually used when a system does not exist or incase of a large and complex system where there is no manual process to determine the requirements. This model allows the users to interact and experiment with a working model of the system known asprototype.The prototype gives the user an actual feel of the system.At any stage, if the user is not satisfied with the prototype, it can be discarded and an entirely new system can be developed. Generally, prototype can be prepared by the approaches listed below.• By creating main user interfaces without any substantial coding so that users can get a feel of how the actual system will appear.• By abbreviating a version of the system that will perform limited subsetsof functions.• By using system components to illustrate the functions that will be included in the system to be developed .Using the prototype, the client can get an actual feel of the system. So, this case of model is beneficial in the case when requirements cannot be freezed initially.This prototype is developed based on the currently known requirements. Development of the prototype obviously undergoes design, coding, and testing, but each of these phases is not done very formally or thoroughly. By using this prototype, the client can get an actual feel of the system, because the interactions with the prototype can enable the client to better understand the requirements of the desired system.Prototyping is an attractive idea for complicated and large systems for which there is no manual process or existing system to help determine the requirements. Risks associated with theprojects are being reduced through the use of prototyping. The development of the prototype typically starts when the preliminary version of the requirements specification document has been developed. At this stage, there is a reasonable understanding of the system and its needs are unclear or likely to change. After the prototype has been developed, the end users and clients are given an opportunity to use the prototype.They provide feedback to the developersregarding the prototype: what is correct, what needs to be modified, what is missing, what is not needed, etc. Based on the feedback, the prototype is modified to incorporate some of the suggested changes that can be done easily, and then the users and the clients are again allowed to use the system.This cycle repeats until, in the judgment of the prototypes and analyst. Based on the feedback, the initial requirements are modified to produce that final requirements specification, which is then used to d