It is difficult to make objective or long-term measurements of people’s quality of life. In part, QOL depends on the frequency and intensity of their emotional experiences. Expectations also play an important role – what are our goals in life, and how does our current state of affairs measure up to those expectations? These are subjective questions, the answers to which will vary with different individuals. There are many different methods of measuring quality of life in terms of health care, wealth and material goods.