In nursing research, vignettes are used less and extensively utilized in psychological social sciences. It is a type of self reported qualitative research where case scenarios, situations are given to the research participants and their perception, opinions, beliefs, and attitudes are elicited within the vignettes. In certain research, text or pictures presented to participants to prompt responses to interview questions. ECG is a frequent safe and inexpensive procedure that supports arrhythmias and ischemia diagnosis. Nurses are usually the first to conduct an ECG and therefore need to know how to interpret it, but many nurses lack ECG Interpretation skills. Aim: The aim of this article is to describe the sequential steps of case vignette tool on ECG and its interpretation prepared for nursing students. Materials and Methods: Development of this tool involves three phases which are: the conceptualization phase, the preliminary item evaluation phase and the scale refinement phase. This case vignette tool development is a part of large-scale study employed a tri-phase which aims to determine ECG Interpretation skills among nursing students. The developed case vignette was submitted to the experts in the field of nursing and medicine. The content validity ratio and content validity indexed was computed. Further, reliability was calculated. Pretesting was done to rule out the feasibility of tool. Results and findings: The computed content validity index and content validity was found to be +1 respectively, which indicates that the developed tool is highly valid. The internal consistency of the tool was calculated by using Cronbach’s alpha correlation coefficient its value was 0.86 which indicates the tool is highly reliable. Conclusion: This study identified the dimensions of the case vignette and contributed to advancing the measurement of the ECG interpretation skills among nursing students. The case vignette is a brief and costeffective instrument that can measure skills of nursing students on ECG interpretation.

Keywords : Case Vignette, Content Validity, Content Validity Index, Content Validity Ratio, Reliability.