A strength of the humanistic explanation of human behaviour is that it has practical applications. This is because the principles of the theory, that individuals have the free will to choose their behaviour has revolutionised counselling techniques and has led to the treatment of Person-Centred Therapy. PCT can be used to treat abnormalities in the real world, such as depression by helping the individual to achieve congruence and self-actualise. Therefore, the humanistic explanation of human behaviour is an important part of applied psychology as it helps to treat people in the real world.