The process of changing or adding to the US Constitution. The original writers of the Constitution decided to make this task difficult by stating that 2/3 of Congress had to approve it; and after that, 3/4 of the states had to approve it. This process is irksome and time-consuming.
The amendment process caused the law 3 years time before it finally passed.
A system states in the US Constitution that allows one branch to cancel or rule out another branch's actions. This is only if there is a logical explanation for the cancelation of the action.
The legislative branch wanted to give President Bush balloons for his birthday, but the jurisdicial branch used checks and balances to stop them from doing so. Bush was sad and ordered a cake of his own with a picture of Osama on it.