Purpose: The purpose of this study was to develop simulation learning program and to evaluate the effects of the program on Clinical competency, Clinical decision making competency, Communicative competency of novice nurses in ER and ICU.

Method: In the phase of program development the learning objectives were three clinical situation scenarios with simulation flow sheets and checklists for simulation learning program. A quasi-experimental non-equivalent control group pre-post test design was used to investigate the effects of simulation learning program on Clinical Competency, Clinical Decision Making Competency, and Communicative Competency. The participants were 30 novice nurses, using a coin toss, 15 participants were randomly assigned to the experimental group and 15 to the control group from C university hospital located in G-city. The experimental group was conducted 4 times from January through April of 2013, whereas a case study was given to the control group. Data were collected using a questionnaire which included Clinical Competency, Clinical Decision Making Competency, and Communicative Competency. The data were analyzed by x2-test, Mann-Whitney U test, Kruskal-wallis test with SPSS win 18.0 program. Analysis of covariance (ANCOVA) was used to treat the covariate about the pre Communicative Competency between experimental and control group.
There were significant differences in Clinical competency, Decision Making competency, Communicative Competency between the two groups.
The hypothesis 3 stating that "The experimental group who received the Nursing Performance Improvement simulation learning program will show higher Communicative Competency scores than the control group receiving a case study" was supported(F=7.81, p=.009), after ANCOVA was used to treat the covariance about the pre Communicative Competency between experimental and control group.

conclusion: This study could contribute to providing specific guidelines for developing a simulation program to improve nursing performance of novice nurses in ER and ICU.