Theory Worksheet A worksheet for IT 9626

Contents


Topic 1: Data, information, knowledge and processing ............................................................................. 4
1.1 Data, information and knowledge ....................................................................................................................................................................... 4
1.2 Sources of data ............................................................................................................................................................................................................... 4
1.3 Quality of information ..............................................................................................................................................................................................10
1.4 Coding, encoding and encrypting data ........................................................................................................................................................11
1.5 Checking the accuracy of data .........................................................................................................................................................................24

Topic 2: Hardware and software ........................................................................................................................... 26
2.1 Hardware ............................................................................................................................................................................................................................26
2.2 System, application and user interface software ..................................................................................................................................33
2.3 Utility software ...............................................................................................................................................................................................................50
2.4 Custom written software and off-the-shelf software ...........................................................................................................................52
2.5 Compiler and interpreter ........................................................................................................................................................................................53

Topic 3: Monitoring and control ........................................................................................................................... 56

Topic 4: E-safety and health and safety .......................................................................................................... 60

Topic 5 : The digital divide ..................................................................................................................................... 67

Topic 6: Using networks ............................................................................................................................................ 69
6.1 Network types .................................................................................................................................................................................................................69
6.2 Video and web conferencing ...............................................................................................................................................................................78

Topic 7: Expert systems ............................................................................................................................................. 84