Developmental Psychology

Observation of an entire population, at a defined time




Pros- Quick and easy

Cons- Uninformative about changes over time

Observation of the same subject, over a long period of time



Pros- Reveals patterns of change over a long period of time

Cons- Difficult to keep participants in the study

Observtion over a short period of time, while an environmental change is occuring



Pros- Reveals repsonse to changes

Cons- Does not reveal patterns of change over a long period of time

Nicolaas Hartsoeker