omisMethods - Information Systems Foundations Methods for...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Information Systems Foundations Methods for Building Systems ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Methods of Building Information Systems Methods 1 Methods for Building Systems Objective of Systems Methods s Structured Systems Development Structured …SDLC …SDLC s Unstructured Systems Development Unstructured ...RAD and Prototyping ...RAD s Other Methods for Building Systems s ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 2 Methods of Building Information Systems ___________________________________ ___________________________________ Methods for Building Systems s ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 3 Objective of any Systems Methodology: • Delivery On-Time Within Project Scope Under/At Budget • • s Choice of Methodology made by IS Choice Project Manager Project Methods of Building Information Systems ___________________________________ ___________________________________ Structured System Development s ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 5 Characteristics of Structured • • • Successful on Medium to Large-Scale Scale Projects Projects Phase or “Step” Oriented Approach Considered a More “Formal” Process STEP 3 STEP 2 STEP 1 Methods of Building Information Systems Methods ___________________________________ ___________________________________ Structured System Development s ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Example Phases • • • • • • • “TA..DA” Feasibility Requirements Functional Technical and Construction Testing Implementation (with any Conversion) Post Evaluation 6 Methods of Building Information Systems Structured System Development s Requirements ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 7 Example Phases and Deliverables Functional Technical Feasibility Construction Testing Implementation Modification(s) Line Length is Relative to Time Spent, Which Equates to $$$ Expended. Linear Progression allows for ion continuous evaluation and continuous approvals. app Methods of Building Information Systems ___________________________________ ___________________________________ Structured System Development s ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 8 Advantages of Structured • • Allows cognitive review of effort and costs. – Minimize the time (money) expended. Achieve business and I.S. understanding Achieve and agreement. and P O S I T I V E S Business rules and needs must be known. – • HIGH LEVEL of a measurable and HIGH productive environment of resource usage productive – Management of I.S. is accountable Methods of Building Information Systems Methods ___________________________________ ___________________________________ Structured System Development s N E G A T I V E S ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 9 Disadvantages of Structured • • • Can be time and resource intensive. – Work is completed with no tangible results “What you ask for, is what you get” Poor I.S. and User Management Reflects only stated Business Rules Reflects – Can suffer from “Scope Creep”...99%ers – Methods of Building Information Systems ___________________________________ ___________________________________ Unstructured Systems Development s ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Characteristics of RAD and Prototyping • • • Successful on Small-Scale Projects. Emphasis on “Analytical Programming. Considered an Informal Design Approach. Methods of Building Information Systems 11 Unstructured Systems Development s ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Characteristics of RAD and Prototyping 3 IMPLEMENT DEVELOPE When will the When cycle END...$$ ? cycle 2 1 Methods of Building Information Systems Methods DESIGN 12 Unstructured Systems Development s ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Advantages of RAD and Prototyping • Delivers a partial component very rapidly. – Always incomplete... Advantage for the sponsor or end-user Small Projects...YES! Medium or Large Projects…Absolutely Not P O S I T I V E S • • All requirements do not need to be known – “Promises” to control costs & design flaws – – Methods of Building Information Systems 13 Unstructured Systems Development s N E G A T I V E S ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Disadvantages of RAD and Prototyping • • • History of delivering incomplete systems. History incomplete LOW LEVEL of a measurable and of productive environment of resource usage. productive Does NOT allow for Costs/Benefits to be Does NOT allow Costs/Benefits to evaluated upfront. evaluated Methods of Building Information Systems 14 Other Methods for Building Systems s ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Application Package Purchase • ERP (SAP, BAAN)… larger business for ERP standardized business functions s End-User Development Tools • Office Automation Tools…small systems Office and/or business environments and/or s Outsourcing • Externalize part or whole of I.S. Function. Methods of Building Information Systems Methods 16 ...
View Full Document

Ask a homework question - tutors are online