- Theories are explanations for psychological phenomena that summarize and organize observations and allow predictions to be made, though theories in psychology are not certain like laws in natural science. - Self-efficacy theory predicts that one's belief in their ability to succeed will determine how hard they try, based on past experiences. - Carol Dweck's theory shows that people's mindsets about intelligence being fixed or changeable can explain success, with a growth mindset believing intelligence can develop leading to different behaviors than a fixed mindset. - An experiment by Carol Dweck and Lisa Blackwell found that low-achieving students who received a session about developing intelligence through exercise improved more in math than a control