... A RESEARCH PROPOSAL PRESENTED TO THE FACULTY OF GRADUATE SCHOOL SOUTHERN LUZON STATE UNIVERSITY LUCBAN, QUEZON, PHILIPPINES THAI NGUYEN UNIVERSITY S.R. VIETNAM IN PARTIAL FULFILLMENT ... effectiveness” (Glebbeek & Bax, 2004). Types Of Turnover. “The two general types of turnover are voluntary and involuntary. Voluntary turnover is when the employee chooses to leave for whatever reason. ... Necessity in retaining qualified and experienced employees: High-performing employees are important to every company as they can bring their creativity, difference, boost the productivity and...