Safety measures 739 Security measures 508 Measurement 469 Computer networks 232 Computer security 138 Educational tests and measurements 116 Prevention 84 Pollution 71 Measure theory 70 Management 59 Data protection 55 Aeronautics 54 Measuring instruments 51 Chemical plants 47 Hazardous substances 47 Construction industry 45 Electronic measurements 45 Chemical engineering 43 Evaluation 40 Computer crimes 39 Testing 39 Air 38 Design and construction 36 Electronic data processing departments 36 Chemical industry 35 Data processing 34 Internet 34 Industrial safety 33 Automobiles 32 Risk assessment 31