MBO is a performance appraisal method where employee goals are aligned with organizational goals. It was first introduced by Peter Drucker in 1954. MBO involves setting specific, measurable goals for employees that are agreed upon by both managers and employees. Progress is monitored periodically and performance is evaluated and rewarded. Studies have found mixed results on MBO's effectiveness in improving productivity and satisfaction. When implemented properly with support from top management and clear goals, MBO can help organizations achieve objectives and motivate employees.