How does article II of the constitution address the flaws that existed in the Articles of Confederation?

First of all, what do you think the flaws of the Articles of Confederation were? If you can specifically state what those flaws were, then you'll know what to look for in the Constitution.

http://bensguide.gpo.gov/9-12/documents/articles/index.html

http://www.law.cornell.edu/constitution/constitution.overview.html