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This lecture explores the definition and significance of systems and subsystems in information technology. A system, derived from the Latin "systēma" and Greek "σύστημα," consists of interacting components that form an integrated whole. Information systems play a critical role in solving business problems by collecting, processing, storing, and providing necessary information. This session covers types of information systems, particularly focusing on customer support subsystems, the role of systems analysts, and the skills required for effective systems analysis and design.
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SYS366 Lecture 1: Systems super systems, systems & subsystems
Definition of a System • System (from Latin systēma, in turn from Greek σύστημα systēma) is a set of interacting or interdependent entities forming an integrated whole. • Source: Wikipedia http://en.wikipedia.org/wiki/System
Information Systems • Systems that Solve Business Problems • Collection of interrelated components that collect, process, store, and provide as output the information needed to complete business tasks
Information Systems • Super systems: • Made up of large, stand-alone systems • Example: the system for the Canada Games 2011 • Large systems are often further divided into subsystems through functional decomposition • Dividing a system into components based on subsystems that in turn are further divided into subsystems (based on the Use Case Diagrams)
Major Subsystems within the Customer Support System • Order entry • Customer service/catalog • Order tracking • Shipping • Back orders • Returns • Sales analysis
Information Systems • Information systems are crucial to modern business • Key to success is thorough systems analysis and design • Systems analyst is a key individual in these activities
The Analyst • Business problem solver • Practical knowledge • Computers • Computer programming • Databases • Understand business problems • Use logical method for solving problems
Required Skills of the Systems Analyst • Technical knowledge and skills • Computer hardware, software, databases, and related devices • Tools to help develop analysis or design specifications • Techniques for completing specific development activities • Business knowledge and skills • Organizational structure • Functional work processes
Required Skills of the Systems Analyst • People knowledge and skills • Communication • Team Management • Ethics and integrity • CIPS
Analyst’s Approach to Problem Solving Research problem Verify benefits outweigh costs Develop solutions Recommend best solution Define solution Implement solution Monitor results
Environment Surrounding the Analyst • Information system configurations encountered will range from PC to large mainframe systems • Job titles of the systems analyst vary greatly • Places of employment vary from small businesses to large corporations
Definition of a Project • A Project is a sequence of unique, complex, and connected activities having one goal or purpose and that must be completed by a specific time, within budget, and according to specification. ( p. 65)
Assignment • Each team is to decompose the super system necessary to run the Canada Games 2011 into major subsystems based on category. For example, Volunteer subsystem • Then the team is to research the web sites for the Olympics being held in Vancouver from February 12 – 28, 2010, and the web site for the Pan American Games being held in Toronto in 2015 and add any subsystems that are unique to them to the table.
