Background: Documenting patient care is a key method of information sharing among healthcare professionals. Whether a patient survives or passes away may depend on prompt, accurate, detailed, and concise documentation. Aim: The present study aimed to assess the effect of the documentation training program on staff nurses' documentation skills. Design: A quasi- experimental design (one group pretest-posttest design) was used in this study. Subjects: A convenient sample consisted of a total of 50 nurses included in the current study who were working in the previous setting. Setting: The study was applied in inpatient units at Damanhour Hospital University. Tool: Self-administered Questionnaire sheet which contained three parts to collect data for this study: (1) Nurses' demographic data, (II) Nurses' knowledge assessment, (III) an auditing checklist of patients' records. Results: slightly more than two-fifth of staff nurses had a high level of knowledge regarding total documentation dimensions in preprogram training phase, while all staff nurses had high knowledge in the post-training program phase and a slight decline in follow-up phase with highly statistically significant improvement with all the phases of intervention. The majority of staff nurses had low total performance levels at preprogram training phase while four-fifth of them had high performance levels in post phase and three-quarters of them had high- performance levels after two months of training intervention with highly statistically significant improvement in total documentation performance levels with all the phases of intervention. Conclusion: A highly statistically significant improvement was detected in total staff nurses' documentation knowledge and performance level during the post and follow-up phases than preprogram training phase. The documentation training program has a positive effect on improving staff nurses' documentation skills. Recommendation: The current study recommended increasing and applying for the documentation training program, information and research findings should be disseminated online. Documentation skills are contained in the distribution manual for new staff nurses.