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APPENDIX 6. HOME TASK 
Speak about Alibaba.com. 
1.  Company revenue 
2.  Name 
3.  History 


 
76 
 
UNIT IV. SECURITY 
LESSON 18. HEALTH AND SECURITY 
 
APPENDIX 1. LEAD IN ACTIVITY 
Work in groups and discuss the pictures. 
What are the potential health threats from 
continuous use computers? Share your ideas with 
the group. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
APPENDIX 2. GLOSSARY 
Copy out and learn by heart new words. 
Word 
Definition 
Ergonomics 
is the scientific discipline concerned with the understanding of interactions 
among humans and other elements of a system, and the profession that applies 
theory, principles, data and methods to design in order to optimize human 
well-being and overall system performance 
Human factors 
are considered to be synonymous with ergonomics, however it is essentially an 
American term, having its scientific roots grounded in psychology, whereas 
ergonomics which, as a science/practice, was formalized after WW2 in Britain, 
considers a very broad range of sciences (e.g. anatomy, psychology, 
physiology, industrial medicine, design, architecture, illumination engineering
etc.) 
Task Analysis 
A systematic approach for documenting and assessing the risks associated with 
a specific task or job. • Hierarchical Task Analysis (HTA) involves looking at 
a job as a series of main or key tasks or objectives and then breaking these key 
tasks or objectives down into sub-tasks and sub-task actions. 

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