Developmental Psychology looks at life as it develops, . It starts with conception and continues until death. Before it would only look at infancy to adulthood. They felt that your personality was pretty consistent. But the fact is that humans live longer now. So it has asks the developmenatlist to explain different phenomena. There are different issues that we see now. Such things as mid-life crises, retirement, families that take care not only of children but, ederly parents. We have the industrial concept of adolesence. Development has really begun to cover more then just children up to age 7. In developmental psychology, we have contibuters from many different schools and apporaoches. We have psychodynamics, behaviorists, cognitions, humainistics, and defintily those from the biological aspect of it.