TAILIEUCHUNG - Lecture Introduction to computing - Lecture 29

In this lesson, you will leam about specific steps you can take to secure your computer system and your data from a variety of threats. You might be surprised to learn that computer security is not primarily a technical issue, and is not necessarily expensive. For the most part, keeping your system and data secure is a matter of common sense. | CSC 101 Introduction to Computing Lecture 29 Dr. Iftikhar Azim Niaz ianiaz@ 1 1 Last Lecture Summary I Computer Programs Programming Language Generations First Generations - Machine Language Second Generation - Assembly Language Third Generation - Procedural Languages FORTRAN, COBOL, C, C++, Java Fourth Generation Fifth Generation Compilers and Interpreters Visual Programming Environments Last Lecture Summary II WWW Development Languages HTML, XHTML XML Extensible HTML (XHTML) Extensible Style Sheet Language (XSL) Extensible HTML Mobile Profile (XHTML MP) CSS CGI and Scripting Languages Web Page Development Web Authoring Environments Objectives Overview System Development System Development Life Cycle SDLC Figure 12-1 6 System Development System development should follow three general guidelines: System Development System development should involve representatives from each department in which the proposed system will be used System analyst is responsible for designing and developing information system Liaison between user and IT professionals Figure 12-2 8 On Going Activities Project management is the process of planning, scheduling, and then controlling the activities during system development To plan and schedule a project efficiently, the project leader identifies: 9 Gantt Chart A popular tool used to plan and schedule the time relationships among project activities Figure 12-3a 10 PERT Chart A Program Evaluation and Review Technique (PERT) chart also can be used for planning and scheduling time Figure 12-3b 11 On Going Activities Feasibility is a measure of how suitable the development of a system will be to the organization A project that is feasible at one point during system development might become infeasible at a later point Thus, systems analysts frequently reevaluate feasibility during the system development project. On Going Activities Documentation is the collection and summarization of data and information Includes reports, diagrams,

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