Answer
Scientific approach to knowledge is based on observation and experimentation. Other approaches to knowledge such as through philosophy or history cannot be observed in the real physical world. Rather they are approached through reasoning and thinking.
Work Step by Step
Scientists observe and perform experiments on the physical world in order to learn more about. Scientific approach is done by a controlled set of procedures.
In a philosophical or historical approach to knowledge, researchers learn through reasoning and thinking rather than observing and experimenting.