Cambridge International AS Level Information Technology, Edition 2021 (PDF)

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About the book:

Publisher: Hodder Education

Author (s): Graham Brown and Brian Sargent

Pages: 371

Edition: 2021

Language: English

Size: 25 Mb

Content:

Introduction v

1 Data processing and information 1

1.1 Data and information 1

1.2 Quality of information 7

1.3 Encryption 9

1.4 Checking the accuracy of data 16

1.5 Data processing 25

2 Hardware and software 42

2.1 Mainframe computers and supercomputers 42

2.2 System software 52

2.3 Utility software 57

2.4 Custom-written software and off-the-shelf software 61

2.5 User interfaces 63

3 Monitoring and control 67

3.1 Monitoring technologies 67

3.2 Control technologies 73

4 Algorithms and flowcharts 85

4.1 Algorithms 85

5 eSecurity 104

5.1 Personal data 104

5.2 Malware 113

6 The digital divide 120

6.1 What is the digital divide? 120

6.2 Causes of the digital divide 121

6.3 Groups affected by the digital divide 123

6.4 The effects of the digital divide 129

6.5 Reducing the effects of the digital divide 133

7 Expert systems 135

7.1 What is an expert system? 135

7.2 Different scenarios where expert systems are used 137

7.3 Chaining 142

8 Spreadsheets 147

8.1 Create a spreadsheet 148

8.2 Test a spreadsheet 206

8.3 Use a spreadsheet 211

8.4 Automate operations with a spreadsheet 221

8.5 Graphs and charts 222

9 Modelling 233

9.1 Modelling 233

9.2 Simulations 247

9.3 Using what-if analysis 251

10 Database and file concepts 255

10.1 Database basics 255

10.2 Designing the database structure 263

10.3 Creating the database structure 265

10.4 Creating a relational database from existing files 271

10.5 Querying the database 273

10.6 Sorting and grouping data 293

10.7 Creating a data entry form 296

10.8 Designing a switchboard 301

10.9 Importing and exporting data 303

10.10 Normalising data 304

10.11 Creating a data dictionary 309

10.12 File and data management 310

11 Sound and video editing 317

11.1 Video editing 317

11.2 Audio editing 332

Glossary 346

Index 354

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