The students in the control group did not receive simulation training.

Case Study Form for Individuals Diagnosed with Dementia: The form developed by the researchers consists of four parts for the case study of an individual diagnosed with dementia. In the first part, students were asked to indicate the "Standardized Mini Mental State Test" score for the individual in the case study. In the second part, students were asked to mark one of the statements "I agree", "I am undecided" and "I disagree" for the nursing diagnoses given in accordance with the case. In the third part, they were asked to mark one of the statements "I agree", "I am undecided" or "I disagree" for the nursing interventions specified for the nursing diagnoses of "Lack of self-care", "Risk of trauma" and "Chronic Confusion". In the last section, they were asked to mark one of the statements "I agree", "I am undecided" or "I do not agree" for the items that should be considered when communicating with a person with dementia.

Case Study Form for Individuals Diagnosed with Dementia: The form developed by the researchers consists of four parts for the case study of an individual diagnosed with dementia. In the first part, students were asked to indicate the "Standardized Mini Mental State Test" score for the individual in the case study. In the second part, students were asked to mark one of the statements "I agree", "I am undecided" and "I disagree" for the nursing diagnoses given in accordance with the case. In the third part, they were asked to mark one of the statements "I agree", "I am undecided" or "I disagree" for the nursing interventions specified for the nursing diagnoses of "Lack of self-care", "Risk of trauma" and "Chronic Confusion". In the last section, they were asked to mark one of the statements "I agree", "I am undecided" or "I do not agree" for the items that should be considered when communicating with a person with dementia.

standardized mini mental test: Developed by Folstein et al. (1975), the test provides the grading of cognitive disorders and evaluates cognitive functions in five different parts (orientation, registration, attention and calculation, recall, and language) (Folstein et al., 1975). Turkish validity and reliability were determined by Güngen et al. (2002) by The highest score from the test is 30. Orientation questions are 10 points, recording memory and recall 6 points, attention and calculation 5 points, naming 2 points, repetition 1 point, commands 3 points, reading 1 point, writing 1 point, structuring skill 1 point. A score of less than 24 on the Standardized Mini Mental Test (SMMT) indicates dementia, a score of 24-26 indicates mild neurocognitive impairment, and a score of 26 and above indicates normal cognitive functions. SMMT was found to be a valid and reliable tool in patients with mild dementia in our society.

Communication Skills Evaluation Form: It was prepared by researchers in line with the literature on the subject (Jootun & McGhee, 2011; Akgün Çıtak, 2016; Dikeç & Kutlu, 2020) in order to objectively evaluate the performance of students regarding communication skills. The form consists of 26 items. The performance of the students, when each step of the student is applied; Evaluated by marking "fully done", "partly done", "did not do"

Case Study Form for Individuals Diagnosed with Dementia: The form developed by the researchers consists of four parts for the case study of an individual diagnosed with dementia. In the first part, students were asked to indicate the "Standardized Mini Mental State Test" score for the individual in the case study. In the second part, students were asked to mark one of the statements "I agree", "I am undecided" and "I disagree" for the nursing diagnoses given in accordance with the case. In the third part, they were asked to mark one of the statements "I agree", "I am undecided" or "I disagree" for the nursing interventions specified for the nursing diagnoses of "Lack of self-care", "Risk of trauma" and "Chronic Confusion". In the last section, they were asked to mark one of the statements "I agree", "I am undecided" or "I do not agree" for the items that should be considered when communicating with a person with dementia (Dilek et al., 2017; Akgün Çıtak, 2016).

Nursing Diagnosis Detection Skill Form: It was prepared with the aim of evaluating students' performance in nursing diagnosis detection skills. Students were asked to write down their nursing diagnoses in accordance with the simulation scenario.

Modified-Simulation Efficiency Tool: The measurement tool for students' perceptions of the effectiveness of learning in a simulation environment consists of four sub-dimensions, namely preliminary information, learning, trust and analysis, and nineteen items. The Cronbach Alpha internal consistency coefficient of the measurement tool is 0.92. The items of the scale are scored from 1 to 5 as "Strongly Disagree", "Partly Disagree", "Undecided", "Partly Agree" and "Strongly Agree". "Pre-informing" sub-dimension score range is 2-10, "Learning sub-dimension" score range is 4-25, "Confidence" sub-dimension score range is 7-35, and "Analysis" sub-dimension score range is 5-25. The total score is obtained by summing the scores of all sub-dimensions. The score range is between 18 and 95, and a high score indicates that the student's perception of the effectiveness of learning in the simulation environment is positive.