Method. In this descriptive survey, accessible population included 65 critical care nurses and nursing managers of the hospital under study out of which 56 people were selected based on stratified random sampling using Morgan-Krejcie sample table. Data were collected using a questionnaire and its validity was confirmed by the views of the experts. The reliability of the questionnaire was 0.99 (Cronbach's alpha). Data were analyzed by descriptive and inferential statistics.

Findings. The mean score of the effectiveness of the CPCR workshop in clinical atmosphere from the perspective of critical care nurses and nurse managers was 3.89 out of 5 in the level of “reaction”. Moreover, the mean score of the effectiveness of “learning” level and “behavior” level were reported 3.97 and 4.02 out of 5, respectively. In the level of the “results” the mean score of the effectiveness was reported as 4.57. The  total average of effectiveness of training in CPCR workshop was 4.11 out of 5. 

Conclusion. The result of the study showed that CPCR workshop was evaluated as an effective program based on the Kirkpatrick model.