Cis 300 Notes

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CIS/319 COURSE NOTES
WK 1 INFORMATION SYSTEMS SYSTEMS DEVELOPMENT SYSTEMS ANALYSIS IT PROFESSIONALS

WK 2

INPUT DEVICES

OUTPUT DEVICES

PROCESSING DEVICES

STORAGE DEVICES

NETWORK DEVICES

WK 3

SOFTWARE ACQUISITION

OPERATING SYSTEMS DATABASE MANAGEMENT SYSTEMS NETWORK TOPOLOGY

PROGRAMMING LANGUAGES

SOFTWARE APPLICATIONS

WK 4

DATABASE STRUCTURE NETWORK OPERATING SYSTEM

DATABASE DEVELOPMENT

DATABASE ADMINISTRATION

WK 5

NETWORK MEDIA

NETWORK CONNECTIVITY

INTERNET

© 2006, 2008, 2009, 2010 University of Phoenix.

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INFORMATION SYSTEMS

SYSTEMS DEVELOPMENT

SYSTEMS ANALYSIS

IT PROFESSIONALS

An information system is a collection of resources working together in a coordinated fashion to store, process and provide data for end-users. The term information systems (IS) is used interchangeably with the term information technology (IT). Five main resources of an information system are: 1. 2. 3. 4. 5. People Hardware Software Data Networks An automatic teller machine (ATM) is a good example of a system that is efficient, effective and competitive. ATM’s have transformed the banking industry.

Benefits of information technology are:      Speed Accuracy Consistency Availability Innovation

Opportunities of information technology are:  Operational – more efficient; IT increases speed and accuracy.  Tactical – more effective; IT provides consistency and availability.  Strategic – more competitive; IT transforms the organization through innovation. © 2006, 2008, 2009, 2010 University of Phoenix.

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INFORMATION SYSTEMS

SYSTEMS DEVELOPMENT

SYSTEMS ANALYSIS

IT PROFESSIONALS

A systems development methodology is an organized approach to manage the development of information systems. The Systems Development Life Cycle (SDLC) is a methodology organized into a number of major activities known as phases. The number of phases can vary from IT organization to IT organization; however, the work that needs to be accomplished is usually the same. Without a formalized, organized approach to developing an application, the result can be that the application does not meet the user requirements, is inefficient, is not well documented and is difficult to maintain. The SDLC is just one methodology used. The classic SDLC is also referred to as a waterfall methodology. The concept of a waterfall methodology is that the output from one phase is the input to the following phase; (it flows over into the next phase). WATERFALL DIAGRAM

One of the major drawbacks of the classic waterfall SDLC is the assumption that if there are any problems or changes introduced in later phases, it will be necessary to repeat all the previous phases. Consequently, the trend is away from the classic waterfall SDLC toward Rapid Application Development (RAD), which uses prototyping and an iterative process. The user is shown a prototype, and then changes are made to the prototype based upon user input. This process is repeated until an acceptable product is created.

© 2006, 2008, 2009, 2010 University of Phoenix.

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SYSTEMS DEVELOPMENT

Systems Development Life Cycle Waterfall Diagram

Initiation

Analysis

Design

Implementation

Support

© 2006, 2008, 2009, 2010 University of Phoenix.

Home

INFORMATION SYSTEMS

SYSTEMS DEVELOPMENT

SYSTEMS ANALYSIS

IT PROFESSIONALS

Analysis is the step in the Systems Development Life Cycle in which IT personnel and business personnel (users) must collaborate. The user needs (or use cases) must clearly be defined. Various types of charts are commonly used in the analysis step. Three common types are flow charts, data flow diagrams (DFD) and entity relationship diagrams (ERD):  Flow charts show the path of data and key operations performed.  Data flow diagrams show the sources and movement of data.  Entity relationship diagrams show things (entities) and their...
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