Life+Cycle+of+a+System

We are going to use this page to create notes on the lifecycle of a system. To start go here and read the theory section: []. Also, read section 28-31 of the Student Handbook for ICT: IGCSE. Once you are finished research for a useful website on the topic and put it in the chart below:

Here are the questions from the activity we did on October 14: The purpose of testing is to check if the system works properly. During the testing, there might me some problems made in data/file structures, validation routines, inputs and outputs. Each of the software that is designed should be tested and collecting evidence by printing out, reports and taking screen shots.
 * ==**//Name//**== || ==**//Site//**== || ==**//Why it is useful//**== ||
 * Mr. Wehrle || TheTeacher99 || Clearly lays out the steps in the system you are going to have to learn for the IGCSE exam. ||
 * Mr. Wehrle || Computer World Article || Goes beyond what is needed for the exam and states there are problems with that particular model. Do you agree with what it says? Why or why not? ||
 * Rio || Star vd || This site explains about how the system cycle goes on and explains briefly how each system is linked to another. ||
 * Masatoshi || System Development LifeCycle || It explains about the definition of System Development Life Cycle briefly and the plans of each terms in the cycle ||
 * Seungjae || Ict Web || Explains each step of the SDLC throughly and also has a broad range of topic that can be used in this topic ||
 * __Testing:__**

The purpose of evaluation is to check the record of the person who wrote the system and people who used that system. If the objectives are not matched, the reasons should be explained.
 * __Evaluation__**

There are two types of documentation in computer software: -User manual (User documentation) -Technical manual (Technical documentation)
 * __Documentation__**

It contains informations on: -purpose of the program -FAQs -how to use programs, including features such as entering data, saving, editing, sorting, and printing -hardware and software requirements
 * __User manual__**

__**Technical manual**__ It contains informations on: -validation routines -program and system flow charts -program coding -data flow diagrams

The symbol diagrams shows the flow of data takes place during the working. -Data source or destination: People or departments that receives the data. -Process: Working that is formed on the data (calculations, sorting, etc) -Data store: It shows any storage: disk, paper, magnetic tape -Data flow: It shows the movement of data. (arrows are used)
 * __Data flow diagrams__**

These are the symbols for the data flow diagrams This is the flowchart of program and system __**Systems Flow Charts**__

A system flow chart shows the flow of data through a system with various symbols. These type of charts do not include much detail but gives the user a general idea of the system.

There may be some variations in some of the symbols.

//Example of a system flow chart//

__**Program flow charts**__

A Program flow chart shows the operations involved in a computer program. Like the system flow chart, the program flow chart uses different symbols to show different operations. Program instructors usually construct this beforehand of actually making the program. It can be described as a blueprint.

//symbols//


 * || Start or end of the program ||
 * ^  || Computational steps or processing function of a program ||
 * ^  || Input or output operation ||
 * ^  || Decision making and branching ||
 * ^  || Connector or joining of two parts of program ||
 * ^  || Magnetic Tape ||
 * ^  || Magnetic Disk ||
 * ^  || Off-page connector ||
 * ^  || Flow line ||
 * ^  || Annotation ||
 * ^  || Display ||

//Example of a program flow chart//

__**Algorithms**__

Algorithms are used to instruct a computer to do a certain task. They are a set of software instructions.


 * //Assessed Task://**

The assessed task, and rubric are here: and

Please contribute to the discussion area by the time the unit is over:

include component="comments" page="Life Cycle of a System" limit="10"