Staff development in professional is generally those of preparing staff to apply the previously acquired knowledge to patient care situation and acquire the kinds of professional and personal skills, attitudes and valuable thoughts essential for entering the health care system. The aim of the current study was to assess the perception of nursing staff about the effectiveness of staff nurse's development program. An exploratory descriptive research design was utilized to answer the question of what the perception of nursing staff about the effectiveness of staff nurse's development program. A convenient sample included (150) Staff nurses and nursing staff working in intensive care units. The study findings showed a statistically significant difference between staff nurses and nursing staff perception, and the nursing staff had the lowest perception of the effectiveness of staff nurse's development program than staff nurses. The study recommendations were regular staff development courses to update the staff knowledge and skills and providing guidance for them, added management training programs as ( leadership skills training , Decision-making and problem-solving training , trains participant on how to control documents ) to staff development program , follow-up the nursing staff's performance by the training team, provide enough facilities, supplies, and equipment to enable the staff to practice what they were learned efficiently