Research literature provides evidence that new graduate nurses are often deficient in clinical judgment (CJ). One way to increase CJ is by using simulations. However, the literature is replete with descriptions of the high anxiety that simulation triggers. It is not currently known how anxiety in simulation affects clinical judgment for undergraduate nursing students. Therefore, the purpose of this study was to explore the effect of different types of anxiety on the clinical judgment of undergraduate nursing students in simulation. This research project used a one-group repeated measures quantitative design to answer the research questions using the conceptual framework of Tanner's (2006) model of clinical judgment. A convenience sample of 45 sophomore-level undergraduate nursing students participated in a study to explore how state and trait anxiety impacted their clinical judgment within an introductory simulation. The results indicated that anxiety did not have a significant impact on clinical judgment. When controlling for baseline state and trait anxiety, pre-simulation anxiety level did not significantly predict scores on the Lasater Clinical Judgment Rubric (LCJR) within the simulation. State anxiety did change significantly between the three time measurements, going up to significantly high levels at pre-simulation. These anxiety levels remained high at post-simulation. The findings imply a changed focus to reframe how anxiety is thought about and its effects. Some anxiety is good and facilitative, and therefore, faculty should not be so worried about reducing anxiety for all students. Rather, nursing educators should help students function despite anxiety, in order to prepare them for real world nursing practice. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]