What might cause scientists to change a scientific theory?

Theories are ideas, educatied ideas, but still only ideas. A scientist may change a scientific theory if new facts or information are found, if other scientists' review find errors, if attempts to apply the theory are unsuccessful, or if they see that the calculations are wrong when they double check them, and so then they would retest and rewrite their theory to correct the errors. 

Idon't think any of em are right, you need to add the number of what paragraph you got your citation from