The development of a person starts from the time when a person is born proving the historical convention of people starts developing only after learning a language. The Cognitive Development Definition is absolutely important to understand this concept.

There are many qualities which are involved in the development of a person starting from the day of birth. The Cognitive Development Definition would encircle all the stages that are involved during the development such as the thought process as thinking is a very big quality of a person who has the liberty to think to differentiate between everything. As there are different choices which are available at all point of time and therefore thinking is one of the biggest attribute. The thinking process also incorporates the process of remembering so that any similar condition that arises can be handled in a familiar fashion. It leads to a great deal of problems which comes along the way and which needs to be solved so as to proceed ahead. The decision making is also a important factor which is the exact replica of the thought person of a person. The Cognitive Development Definition is analyzed by the different sets of exams which are conducted where the intelligent quotient is tested and then the development of a person is tested. It generally shows how a person can perceive any situation and then the way he judges that situation after which how he solves that complex problem. The power of reasoning plays quite an important role in solving each and every complex problem and the memory which is remembered with the help of the memory power. There have been many theories which have been suggested by great research scientists and other psychologists to prove the rate of development in a person is also dependent on many external factors in the way how the person is brought up from their childhood days and the things that they have perceived from the surrounding which played quite an important role in the development of a person. Social situations also play an important role in the development of a person.

During the year 1916, Lewis Terman who is the first person to generate the test for the Intelligent Quotient and he developed it quite wisely as he was a psychologist and he had derived to this idea from one of the models used in the French times during the year 1905.