Background: The endless criticism of mal- practice of graduates of the Baccalaureate degree nurses, and the dissatisfaction of the graduates themselves, in addition to the chronic complaints of stakeholders and students from their clinical evaluation grades, paved the way to think about the problem. Factors that lead to the project are: A. Lack of permanent professors in the participating schools, B. Complaints of the newly appointed clinical instructors from lack of formal and informal preparation for carrying out the role of clinical assessment. In addition,  of the clinical instructors reports of lack of objective assessment checklist. The objectives of the study were: Capacity building (CB) of clinical instructors and assistant lecturers to develop a Learning Guide and Standardize Clinical Assessment checklist and use it for assessing student nurses' clinical performance. The study utilized a quasi experimental design using pre-post and retention – test after one year from the Capacity Building Intervention. Subjects: were 100 CI working at three Community universities in Egypt.The study was carried out at the three faculties of Nursing. Method: Tools for data collection included: A questionnaire that was used for pre, post and retention test (after one year) to illicit personal profile of subjects, knowledge about: clinical assessment, developing learning guide and assessment checklist, and attitude towards clinical assessment. B. An observation checklist, to assess participants' performance while assessing students in clinical environment before and after the CBI, a third observation was done after one year. Results: results showed that the intervention was successful in increasing the knowledge, improving the attitude and improving the practice while evaluating student nurses. The project was effective in developing a clear, comprehensive, applicable, and objective assessment tool and capacity building of participants.