[en] The Radiotherapy chart is the paper form used by the multi-disciplinary team of the Radiotherapy [RT] Unit to convey information and register treatment orders. The chart is a major tool which helps the medical and para-medical staff to provide the correct treatment to the patient and to assure that every step is performed appropriately and approved. For this reason, the RT chart is one of the quality assurance tools used in the Unit. In the last decade, the RT chart used at Rambam Medical Center was very simple, 4 pages long, designed by the staff members themselves. Several errors in delivering RT led to a decision to involve the Research Center for Work Safety and Human Engineering at Technion. This group conducted a human factors and safety analysis study in the RT Unit. After both general and focused analyses, the group recommended redesigning the RT chart which plays an important role as an information and guiding map, affecting the quality of treatment and the patient's health and safety