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1、可行性分析與系統建議書Alex Lai可行性分析可行性 (feasibility) 可行性是一種評量，用 來評估資訊發展系統將對組織有何利益。可行性分析 (feasibility analysis) 是評量可 行性的一個過程。可行性的漸進式約束法 (creeping commitment) 表示可行性應該在整個生命週 期中評估。可行性的四種測試l操作可行性是一個解決方案在組織中運作時 ，令人滿意程度的評量。它同時也是人們對此 系統專案感想的評量。l技術可行性是一個特定技術解決方案的實用 性，以及技術上的資源與專業知識的可利用性 之評量。l時程可行性是專案的時間表合理程度的評量 。l經濟可行性是
2、專案或解決方案的成本效益之 評量。建議的系統方案之成本備選系統表備選系統表(candidate systems matrix)說明備選系統的相似與相異 之處；但是，它不提供分析。備選系統表範例CharacteristicsPortion of System Computerized Brief description of that portion of the system that would be computerized in this candidate.Benefits Brief description of the business benefits that would be
3、 realized for this candidate.Servers and Workstations A description of the servers and workstations needed to support this candidate.Software Tools Needed Software tools needed to design and build the candidate (e.g., database management system, emulators, operating systems, languages, etc.). Not ge
4、nerally applicable if applications software packages are to be purchased.Candidate 1COTS package Platinum Plus from Entertainment Software Solutions would be purchased and customized to satisfy Member Services required functionality.This solution can be implemented quickly because its a purchased so
5、lution.Technically architecture dictates Pentium III, MS Windows 2000 class servers and workstations (clients).MS Visual C+ and MS Access for customization of package to provide report writing and integration.Candidate 2Member Services and warehouse operations in relation to order fulfillment.Fully
6、supports user required business processes for SoundStage Inc. Plus more efficient interaction with member accounts.Same as candidate 1.MS Visual Basic 5.0 System Architect 2001 Internet ExplorerCandidate 3Same as candidate 2.Same as candidate 2.Same as candidate 1.MS Visual Basic 5.0 System Architec
7、t 2001 Internet Explorer(Continued)備選系統表範例 (續)CharacteristicsApplication Software A description of the software to be purchased, built, accessed, or some combination of these techniques.Method of Data Processing Generally some combination of: on-line, batch, deferred batch, remote batch, and real-ti
8、me.Output Devices and Implications A description of output devices that would be used, special output requirements, (e.g., network, preprinted forms, etc.), and output considerations (e.g., timing constratints)Candidate 1Package solutionClient/Server(2) HP4MV department laser printers (2) HP5SI LAN
9、laser printersCandidate 2Custom solutionSame as candidate 1.(2) HP4MV department laser printers. (2) HP5SI LAN laser printers (1) PRINTRONIX bar- code printer (includes software & drivers)Web pages must be designed to VGA resolution. All internal screens will be designed for SVGA resolution.Candidat
10、e 3Same as candidate 2.Same as candidate 1.Same as candidate 2.(Continued)備選系統表範例 (續)CharacteristicsInput devices and Implications A description of input methods to be used, input devices (e.g., keyboard, mouse, etc.), special input requirements (e.g., new or revised forms from which data would be i
11、nput), and input considerations (e.g., timing of actual inputs).Storage Devices and Implications Brief description of what data would be stored, what data would be accessed from existing stores, what storage media would be used, how much storage capacity would be needed, and how data would be organi
12、zed.Candidate 1Keyboard & mouse.MS SQL Server DBMS with 1000GB arrayed capability.Candidate 2Apple “Quick Take” digital camera and software (15) PSC Quickscan laser bar-code scanners (1) HP Scanjet 4C Flatbed Scanner Keyboard and mouseSame as candidate 1.Candidate 3Same as candidate 2.Same as candid
13、ate 1.可行性分析表可行性分析表 (feasibility analysis matrix)。用備選系統的分析和評等來補 充說明備選系統。可行性分析表範例Feasibility CriteriaOperational FeasibilityFunctionality. A description of to what degree the candidate would benefit the organization and how well the system would work.Political. A description of how well received this
14、solution would be from both user management, user, and organization perspective.Technical FeaasibilityTechnology. An assessment of the maturity, availability (or ability to acquire), and desirability of the computer technology needed to support this candidate.Expertise. An assessment of the technica
15、l expertise needed to develop, operate, and maintain the candidate system.Economic FeasibilityCost to develop:Payback period (discounted):Net present value:Detailed calculations:Schedule FeasibilityAn assessment of how long the solution will take to design and implement.RankingCandidate 1Only suppor
16、ts Member Services requirements and current business processes would have to be modified to take advantage of software functionality.Score: 60Current production release of Platinum Plus package is version 1.0 and has only been on the market for 6 weeks. Maturity of product is a risk and company charges an additional monthly fee for technical support.Required to hire or train C+ expertise to perform modifications
