Marilyn A. Bosito 07/008/08 0A OOA
SYANAL
Mr. Pajo
Book: System Analysis and Design with Modern Methods
Author: Len Fertuck
Reference: LRC Extension (QA 402 F471995)
Book Review # 7
Chapter 4
An espionage organization is a collector: it collects raw information. That gets processed by machinery that is supposed to resolve its reliability, and to present a finished product.
Aldrich Ames
This chapter describes the technical, organizational, and financial constraint that have to be consider before a subsystem implemented. The technical constraints are related to the availability and capability of hardware, software, and people. The organizational constraints are related the organization, the departments, and individuals. Technical organization constraint must be overcome or they will make it possible to complete the subsystem successfully
In this chapter also explain how to estimate the tangible and intangible cost and benefits of each subsystem. It also discusses how to determine the technical feasibility of each subsystem, determine organizational feasibility, estimate the cost of a project, and estimate the tangible and intangible.
Manual system is appropriate when a task is complex. Existing system is system already exist. New system/ purchased system is usually cheaper, better and faster.
Technical feasibility has three kinds technical feasibility it concerned with capability and availability of hardware software and people, organizational feasibility it concerned with the need for leadership and the acceptance of changes that accompany the development project , and financial feasibility means the benefits of the project or the greater than the cost .
Hardware concerns in DBMS environment whether a computer is available that is powerful enough to handle the proposed load. They need more powerful for three reasons:
- File structure design for flexibility
- More data validation and security checking
- Demands for application program
The heart modern environment is the DBMS software that validates the data, stores it, and retrieves. The software that is used to implement the system must be chosen carefully. There are several criteria to be considered:
Vendor feasibility
- Portability
- Efficiency
- Distributed Database
- Productivity Features
- Relational Database
People who intend to build information in system in a modern environment need new set of skills. In the modern environment the SDLC changes significantly. This result in several changes in the way programming is done.
New skills include new language for building application, new system development life cycle, and new ways of interacting with users through prototyping and group design session. Broader view new language requires a broader level to think. New development life cycle it reverse many elements of traditional SDLC. More user contact modern system requires much more contact with the users.
Personnel have to acquire new design skills and the ability to work in the new environment. These skills are not the difficult to acquire, but people must resist change. They often prepare to continue doing what they what they have previously learned to do rather than risk using new methods.
Financial feasibility involves tangible and intangible factors. The tangible cost of hardware and software are relatively easy to evaluate. The cost related to writing program is harder to identify. Function point analysis can be helpful in estimating the cost of coding programs. Case and DBMS integrates the system. An alternate method of cost justification is to estimate overall saving based on either estimated Times Saving Time Salary (TSTS) or the Hedonic method of estimating the value of the time release by new system.
Al of the analysis is worthwhile only if the people in the organization have a desire to make the new system work. Without commitment to the management and the cooperation by staff the system does not got implemented satisfactory.
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