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Technical System Options

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Presentation on theme: "Technical System Options"— Presentation transcript:

1 Technical System Options
Specify technical environment Confirm functionality of new system Analyse impact on organisation Provide cost/benefit analyses Provide a stop/go point e.g. Like Feasibility and Business System Options Often the basis for procurement Enables detailed physical design

2 Technical System Option Components
End product of Stage contains following documents: Technical Environment Description (TED) System Description Impact Analysis Outline Development Plan Cost/Benefit Analysis

3 Technical Environment Description Hardware
Hardware TED is generic rather than specific System Diagram showing layout number of terminals or PCs printers communication lines processors other devices Hardware also subject to System TED

4 Technical Environment Description System
Textual descriptions which may cover standards communications environment installation upgrade arrangements reliability serviceability availability maintainability software

5 Technical Environment Description Software
May cover following aspects: data management software system recovery and dumping facilities operating system application packages construction software e.g. Programming languages, testing tools development environment access rights and security system sizing space requirements processing performance first-cut physical design

6 System Description Shows how option satisfies Requirements Specification Supports major decisions taken in Business System Options Includes alternative systems with trade-offs Shows degree to which system requirements met NB. It is also important to show which functions/facilities will not be provided Includes Required System Logical Data Model Function Definitions Requirements Catalogue (showing solutions based on the option)

7 Impact Analysis Explains effects on user environment Should cover
organisation and staffing changes in user operating procedures implementation considerations such as conversion savings comparative advantages and disadvantages of alternative TSOs Includes issues documented in following products: Training Requirements Description User Manuals Requirements Description Testing Outline Take-on Requirements Description

8 Outline Development Plan
Enables development costs to be estimated Shows next module in detail Shows outline of subsequent plans Should contain time, resource and cost estimates for physical design program design and programming procurement system testing implementation

9 Cost/Benefit Analysis
Most objective way to compare merits of options Cost/Benefit Analysis should cover: development costs operating costs tangible benefits and displaced costs i.e. Current system costs eliminated by new system cost containment Intangible benefits improved product quality improved service to customers greater job satisfaction for employees improved management information

10 Considerations for TSOs
Staff involved External and internal constraints Development of outline Technical System Options Refining Technical System Options Making the selection Documenting the selection

11 Staff Involved in Technical System Options
Project board often assesses TSOs and makes selection may terminate project if no suitable option found Project Manager or Module Manager finalises TSOs finalises and presents TSOs Analysts research and document requirements formulate TSOs for presentation

12 The Decision Makers Usually project board
Special review group including users and IT specialists Standard QA review group Consensus approach selection made by project board based on user views

13 External Constraints Imposed from outside the project
Typical constraints include delivery dates total costs hardware and/or software preferences

14 Internal Constraints Set within the project by the user
Typical constraints include mandatory facilities e.g. On-line access, word processing minimum service levels e.g. Mean time between failures, maximum time to restore system, availability, reliability data storage space requirements critical timing criteria information objectives operating environment conditions security requirements interfaces to other Information Systems

15 Making the Selection Present TSOs
NB. Presentations frequently made to users as well as Project Board Prepare carefully for presentation provide amplification and answer queries record significant comments Often selection chosen is hybrid of options document the selection record reasons for selection Update selected Technical System Option Update associated Technical Environment Description

16 Further Activities Develop Application Style Guide from Installation Style Guide Service Level Requirements become the basis for Service Level Agreements Physical design will be based on the Technical Environment Description

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