Lesson 1 data processing

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Lesson 1 data processing

  1. 1. DATA PROCESSING<br />LESSON 1<br />
  2. 2. 1-1 Data Processing<br />All through the different stages of civilization, man has always tried to look for ways to simplify work and to solve problems more efficiently.<br />Data is of little value if it remains in the form of quantities and numbers<br />
  3. 3. 1-2 Categories of Data Processing<br />Mechanical Data Processing<br />It uses a combination of manual procedures and mechanical equipment<br />It uses various devices such as typewriters, sorters, calculators , collators , tabulators , duplicators and verifiers.<br />Electronic Data Processing<br />Different types of input , output and storage devices may be interconnected to an electronic computer to process data.<br />
  4. 4. 1-3 Definition of Terms<br />Data is defined as any collection of facts<br />Data Processing is the manipulation of data into amore useful forms.<br />It is the modern name for paper work and involves the collecting, processing and distributing of facts and figures to achieve a desired result.<br />
  5. 5. 1-4 Data Processing Cycle<br />INPUT<br />PROCESSING<br />OUTPUT<br />
  6. 6. INPUT - In this step the initial data , or input data , are prepared in some convenient form for processing. The form will depend on the processing machine.<br />PROCESSING – In this step the input data are changed, and usually combined with other information , to produce data in a more useful form.<br />
  7. 7. OUTPUT – Here the result of the preceding processing steps are collected.<br />
  8. 8. 1-5 Expanded Data Processing Cycle<br />Origination – is a step which refers to the process of collecting the original data. An original recording of the data is called a source document.<br />Distribution – it refers to the distribution of the output data. Recordings of the output data are often called report documents.<br />
  9. 9. Storage – data processing results are frequently placed in storage to be used as input data for further processing at a later date.<br />
  10. 10. EXPANDED DATA PROCESSING CYCLE<br />ORIGINATION<br />INPUT<br />PROCESSING<br />STORAGE<br />OUTPUT<br />DISTRIBUTION<br />
  11. 11. EXPANDED DATA PROCESSING CYCLE<br />ORIGINATION – is a step which refers to the process of collecting the original data. An original recording of the data is called a source document.<br />DISTRIBUTION – this step refers to the distribution of the output data . Recordings of the output data are often called report documents.<br />
  12. 12. STORAGE – is a crucial in many data processing procedures . Data processing results are frequently placed in storage to be used as input data for further processing at a later date. The two flowlines between the processing box and the storage box indicate the interaction of these two steps. A unified set of data in storage is called a file. Usually a file consists of a collection of records, where<br />
  13. 13. each record contains similar data items, and a collection of related files is called a data base.<br />

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