One should not forget that the discipline of Psychology is a lot different from the popular psychology that does a lot of psychologizing regarding human behavior and mental states. Psychology is commonly described as the science of behavior and mental processes. Psychologists view their field as basically scientific in nature and this suggests that psychologists actually see their field as having a very broad scope.
In fact, they perceive it as being concerned with virtually everything we do, feel, think or experience. This refers to anything we say or do through the subtle changes in the electrical activity occurring deep inside our brains. If it can be observed and measured, then it fits within the boundaries of the science of psychology. Similarly, by cognitive processes, psychologists mean every aspect of our mental life-thoughts, memories, mental images, reasoning, decision making and so on. In short, everything that encompasses the aspects of the working of the human mind is included in the discipline of psychology.
In their efforts, the psychologists encompass an avast range of phenomena at various levels; for example, it can be an individual or group, a community or culture, and even other different domains. They offer insights to the candidates who facilitate acquiring of knowledge and skills, relevant to their personal growth. Indeed, psychology is relevant to everyday life. Psychometric assessment closely examines an individual, how well he knows about something and how efficiently he can put them to work. How careful and quick his sense works, whether he is able to tackle a situation well when confronted with a problem, etc. It also tests his potentialities, inherent skills, and knowledge. The knowledge generated in psychology is closely related to common sense, but it will be wrong enough to say that it is only common sense because there are many such concepts and theories in psychology which actually challenge common sense and beliefs.
It may be noted that psychology is not always defined in ways it is actually presented in the selection of employees in industrial organizations and while assessing them. Philosophy and physiology apparently are the parent subjects of psychology. Philosophers had long attempted to answer the questions in this field through careful reasoning or rationalism. Though, by the end of the 19th century, many philosophers reached to conclusions that the questions about the human mind cannot be answered solely by means of reasoning and that it required a careful observation. Careful observation would definitely mean an empirical approach to the problem. This however raised a much serious question of how could such observations be made?
Psychology gradually emerged over the course of the 19th century, when many philosophers had their attention to questions about the human mind. Questions like how do we perceive the world around us? Do people have free will or are their actions determined by events outside and inside their bodies? What is the link between mind and body or between the physical worlds in which our bodies clearly exist? Where do our thoughts, feelings, and consciousness emerge from? Why and how did they begin to crop up and so on.