The author Pink has used scientific studies and facts to assert his point and reveal the reason behind motivation. The older models of motivation described a reward and punishment system, which Pink believes is outdated. This system of motivation ran on the purpose of external factors to motivate us. External factors such as money or fame were the rewards for hard work. It also became the basis of motivation. Money can encourage. Fame can persuade. However, Pink disagrees with this notion since these are extrinsic features that can change us on the inside. So, Pink suggests that the motivation we feel is from within ourselves – intrinsic.