Executive orders are a significant source of presidential power although scholars disagree on the nature of that power. It has been argued that executive orders are an indication of a president's failure to persuade others to act as he desires; others contend that executive orders offer "power without persuasion." This dissertation introduces the conditional model of executive order issuance and duration in order to offer a synthesis to these competing views, and to offer a better understanding of the opportunities and constraints faced by the president when choosing to act unilaterally through executive orders. The conditional theory holds that both the issuance and duration of executive orders is a function of the president's ideological proximity to Congress and the Supreme Court, and the availability of fresh policy space.