An introduction to the analysis of doctor chris nielson

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An introduction to the analysis of doctor chris nielson

Requirements Determination and Requirements Structuring By Zhenyu Zhu Abstract Requirements determination and requirements structuring are two core components of system analysis. Traditionally, interviewing, questionnaires, directly observing and analyzing documents are four main methods adopted by system analysts to collect information.

An introduction to the analysis of doctor chris nielson

JAD and prototyping are two modern requirements determination methodologies, which are developed and based on the previous traditional methods. A well-structured representation of system requirements can dramatically improve the communication among analysts, designers, users, and programmers. DFD, structured English, decision tables, decision trees, and E-R diagrams are traditional primary requirements structuring tools.

While RAD SDLC packs traditional analysis phase and part of design phase into one step [21]OOA tries to make the outcomes of analysis phase can be reused by the following developing phases.

Introduction Analysis is the first SDLC phase where we begin to understand, in depth, the needs for system. System analysis involves a substantial amount of effort and cost and is therefore undertaken only after management had decided that the systems development project under consideration has merit and should be pursed through this phase.

Most observers would agree than many of the errors in developed system are directly traceable to inadequate efforts in the analysis and design phases of the life cycle.

Requirement determination, Requirements Structuring, and Alternative generation and selection. The third one is usually regarded as the automatic result from the first two processes.

So, in this article, I focus on requirements determination and requirements structuring. Requirements determination is the beginning sub phase of analysis.

In this sub phase, analysts should gather information on what the system should do from as many sources as possible. There are some traditional methods to help collecting system requirements, such as interviewing, survey, directly observing users, etc.

Nowadays, some modern requirements colleting methods, such as JAD and prototyping, emerged. Requirements structuring is the process to use some kind of systematical and standard, well-structured methods to model the real world.

Traditionally, we use data flow diagram for process modeling, decision table or decision tree for logic modeling, and Entity-relationship diagram for data modeling. These modeling tools usually separately model only one face of the real world.

Introduction

So, when we try to show the integral picture of a system, we usually choose more than one of the above requirements structuring methods. Rapid Application Development RAD is an approach that promises better and cheaper systems and more rapid deployment by having system developers and end users work tighter jointly in real-time to develop systems.

Usually, RAD allows usable systems to be built in as little as days. It brings several system development components together.

Although OOP has become popular in computer world, whether OOA is superior to traditional methods is still a question mark. The objectives of this article are to introduce some widely adopted basic requirements determination and requirements structuring methods, compare and contrast those methods and try to find a best way for system requirements analysis.

Requirements Determination Collection of information is at the core of systems analysis. Information requirement determination IRD is frequently and convincingly presented as the most critical phase of information system IS development, and many IS failures have been attributed to incomplete and inaccurate information requirements.

There are many methods to collect information. This article will discuss some basic and widely adopted ones of them.

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Interviewing is one of the primary ways to gather information about an information system. A good system analyst must be good at interviewing and no project can be conduct without interviewing. There are many ways to arrange an effectively interview and no one is superior to others.

However, experience analysts commonly accept some following best practices for an effective interview: Choosing right questionnaires respondents and designing effective questionnaires are the critical issues in this information collection method.

People usually are only use a part of functions of a system, so they are always just familiar with a part of the system functions or processes. In most situations, one copy of questionnaires obviously cannot fit to all the users.

To conduct an effective survey, the analyst should group the users properly and design different questionnaires for different group. Moreover, the ability to build good questionnaires is a skill that improves with practice and experience.Dr.

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Introduction Analysis is the first SDLC phase where we begin to understand, in depth, the needs for system. System analysis involves a substantial amount of effort and cost and is therefore undertaken only after management had decided that the systems development project under consideration has merit and should be pursed through this phase.

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