The fundamentals of any UI Designer to know are:

• color & contrast
• white space (the space between design elements)
• visual hierarchy (fonts, bold, italic, etc)
• complexity vs simplicity
• consistency
• scale (size of the text and design) 

Social constructivism explains that the interaction people have with their environment creates all knowledge. The idea of normal is constructed through our relationship with our surroundings. It means people will always see normality and abnormality from a social point of view.

An easy way to understand the term is through the opposite of normal - which is "pathological" or abnormal.

There are four different criteria for defining abnormality:

• Statistic approach. It is based on the idea that norm...