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Sartori. 1994. Neither presidentialism nor parliamentarism. In The Failure of Presidential Democracy, eds Linz and Valenzuela.

Summary

Semi-presidential and semi-parliamentary systems are superiors to their pure-presidential and pure-parliamentary counterparts because they avoid the structural gridlock and feeble and inconstant government inherent in both. Political context (party system, etc.) also plays a role.

Definitions

Pure Presidentialism

Must have all three: (1) head of state is popularly elected; (2) parliament can neither appoint nor remove the government; (3) the head of state is also the head of the government (cabinet).

Pure parliamentarism

Must have all three: governments are appointed, supported, and (if necessary) dismissed by the parliament.

Argument

Pure presidentialism is bad

Pure-Presidentialism is structurally damned; Recent Congressional-Presidential (with the exception of Clinton) travails prove it. Pure-presidential regimes rarely survive, and those that do (US, mainly) cease to function during periods of divided government--which the US has experienced for several years now. [The more recent lit on US divided government would disagree.]

Also, videopolitics (modern candidate-centered politics) increases the risk of electing a doofus because voters are likely to vote with their passions instead of the reasons.

Pure parliamentarism is also bad

Valenzuela defends parliamentarism over presidentialism by claiming, "The crises of parliamentary systems are crises of government, not regime" (as opposed to presidentialism, where deadlock leads to a coup or other crisis of democracy). However, partisans of presidentialism claim that (pure) parliamentary systems are immobilist and inefficient.

Semi-presidentialism is probably slightly better. 3 flavors:

1. First above unequals. E.g. British PM. Absolute authority over cabinet membership.
2. First among unequals. Not the party leader, but expected to stay even if cabinet membership shifts.
3. First among equals -- comes and goes with cabinet as a whole. Just a bunch of separately selected cabinet members (e.g. in a consociational bargain).

Context matters in deciding among these flavors:

Electoral systems color party structure and governmental stability. And the party structure influences which of these flavors is best. The British system requires a two-party system with strong discipline, for example.

Parliamentary fit Parties:

A functioning parliament is dependent on well-disciplined and cohesive parties. Parliamentarism can't be foisted on a system with incompatible parties. Thus, Brazil's recent [1994] talk of switching to parliamentarism is misguided, since its parties have almost no role. Politicians switch party frequently and frequently defect against the party line.