ABSTRACT: The purpose of this paper is to recommend a quantitative model based on the outcomes from a comprehensive literature review of multiple studies to identify the most effective leadership style among mid-level managers in a healthcare setting. This literature review includes theories of leadership and discusses the usual leadership methods associated with mid-level managers. This study addresses the effectiveness of transactional, transformational, and passive leadership styles of middle level managers in healthcare organizations. The proposed quantitative non-experimental correlational study would examine the statistical relationships between the independent variables of three leadership styles (transformational, transactional, and passive leadership) and the dependent variable of leadership effectiveness among mid-level managers in the healthcare industry. This literature analysis proposes how to clearly define the variables transformational leadership, transactional leadership, passive leadership, and leader effectiveness which would eventually make it possible to quantify and measure them. KEYWORDS: Middle Management, Leadership, Healthcare, Quantitative Model