ETL PRELIMS

Software and Hardware Application

• Software - Instructions that tells a computer what to do

• Evolution of Era

  • Punch card - limited distribution and custom software “batch operators”

• Characteristics of Software

  • Doesn’t wear out

  • Continue to be custom built

  • Operational, Traditional, Maintenance

• Operating System

  • User friendly

  • Efficiency

• Functions of OS

  • Process management

  • Memory management

  • Input/Output management

  • File management

  • Network management

• Types of Operating Systems

  • Batch operating system - Is a technique in which an Operating system collects the programs and data together in a batch before processing starts

  • Time sharing Operating system - Multi tasking Operating system allows the user to perform more than one computer task at a time

  • Distributed Operating system - Loosely coupled systems software over a collection of independent, networked, communicating, and physically separated computational nodes

  • Network Operating system - Run on a server and provides the capacity to manage data, users, groups, security, application and other types of networking

  • Real time Operating system - Intended to serve real time application that process data as it comes in typically without buffer delays

    • Soft real time systems - missing the requirements (time) degrades the quality

    • Hard real time systems - missing the requirements (time) is a total failure

• Prototype - sample of a model

  • Experimental model to test or validate ideas, design assumptions and other aspects

  • Expresses the product implementation logically or physically

  • Prototyping - typically simulates only a few aspects

• Types of Prototype

  • Low fidelity

    • Wireframe

    • Storyboards

    • Diagrams

    • Animation

  • High fidelity

    • Interactive UI Mockup

    • Physical Model

    • Wizard of OZ prototyping