In-service training programmes play a pivotal role in enhancing nurses’ clinical skills through diverse activities such as hands-on workshops, simulations, and practical exercises. These activities enable nurses to acquire new procedures, techniques, and interventions, which directly contribute to improved patient outcomes. This study presents the outcomes and experiences gained from the implementation of Kern’ ’Six-step approach in designing an orientation training programme for new nurses within a private health care institution, aiming to update the curriculum. This descriptive retrospective file review encompasses 285 orientation training sessions conducted for new nurses at Acıbadem Health Group (AHG) between 2017 and 2022. Data collection involved computing pretest and post-test score averages, determining simulation score averages for participants, and using an institution-developed training evaluation form. Statistical analyses were performed using the SPSS software. Notably, 2021 witnessed the highest frequency of training sessions, constituting 14.7% of the total, while 2018 saw the highest number of participants, accounting for 15.97% of the total. Although variations in training sessions and participants across different years were observed, the average number of education sessions remained consistent without statistically significant differences. The participants test scores revealed promising results, with the pretest averaging 61.76 and the post-test scoring an average of 81.10. In addition, the mean scores for the Adult CPR Script and Pediatric CPR Scenario were 89.52 and 87.28, respectively. These findings shed light on the training program’s overall outcomes and effectiveness. Particularly striking were the improvements in participant’' test scores, both in the pretest and post-test, affirming the programs efficiency. This study underscores the intricate interplay between education, test scores, and overall satisfaction within the training programs.