The aim of psychological science is to observe and describe the processes of human experience, human actions and human behavior, and to analyze their general and specific regularities. Compared with former conceptions the understanding of psychology has become more comprehensive. In the past, psychologists examined only the subjective experience of persons, or those parts of their behaviour which can be observed directly. Today, mainly complex human actions are the starting points of analysis.
Human actions have a graduated order.
The psychological processes, such as perception, cognition, memory, problem solving, speech, emotional and motivational evaluation, and the psychomotor processes are adapted and oriented to these levels and phases. Their function depends on the different tasks which they have to solve at the single levels and phases. They can direct, modify, and apply them according to the tasks which are to be performed. There exist multiple and diverse relations between our actions, and our social, natural and technical environment. Psychological analyses are therefore nowadays directed more towards the interactions of these complex systems.