The “big-five” approach to personality disorders is receiving recognition. It is now having a great amount of research supporting and being done on it. Further studies are being done for future references. This “Big Five” Theory of Personality Disorders describes all people with personality disorders under five supertraits. Part of this theory is to drop the use of personality disorder categories altogether.
Activity theory is a framework or a descriptive tool for a system. Consider the entire activity/work beyond just one actor or user. Accounts for environment, history of a person, culture, role of the artifact, complexity of real life action etc...
the Egyptians began making Glass that is produced from a mixture of silica-sand, lime and soda. which is different from what we use to make glass making it different from others.
apartheid was a very wrong racial idea. Democracy's were important after South Africa banned apartheid in 1991 because they were South Africa's new government.
Note: Don't expect me to give you a good answer because I am only 10 years old