For a theory or hypothesis to be useful it must be specific enough to both predict what should happen and what will not happen. This criterion of scientific thinking is known as .

Falsifiability

Explanation:

Falsifiability:

Falsifiability is an important principle in science philosophy. A theory or hypothesis only be considered scientific if it has the possibility of rejection and acceptance. It means, before acceptance of hypothesis it must be disprovable.

Example: "All swans are white" is an example of falsifiability because black swans are also there.