Please explain the difference between presidentialism and parliamentarism.

Please explain the difference between presidentialism and parliamentarism.

I need an undergraduate level essay of 600 words answering the following question: Please explain the difference between presidentialism and parliamentarism in terms of the relation between the legislative and the executive? In your answer, use the following article, which can be reached from the link below. Juan Linz, “The Perils of Presidentialism”. http://scholar.harvard.edu/levitsky/files/1.1linz.pdf