Do the constitutionally defined powers of the three branches of government differ from the actual powers exercised by them?

1. Do the constitutionally defined powers of the three branches of government differ from the actual powers exercised by them? Give examples of how each branch of government has “reinterpreted” one of their constitutional powers.
2. What role do each of the three branches of government play in the decision-making/ policy-making process? Is this relationship defined by cooperation or conflict? Explain and give examples.