"Informed Consent Form" and "Voluntary Consent Form" will be presented to the students assigned to Group 1 in the first interview and their consent will be obtained, "Student Information Form (ANNEX-1)", "CIBS (ANNEX-3)", PCI (ANNEX-4), CPI (ANNEX-5) and SB3S (ANNEX-6) will be applied.

After the initial data are collected, 2-3 sessions of individual interviews will be conducted to assess the student's suitability for Group CIPT.

In the first interview, "Informed Consent Form" and "Voluntary Consent Form" will be presented to the students assigned to Group 2 and their consent will be obtained, and "Student Information Form (ANNEX-1)", "CIBS (ANNEX-3)", PCI (ANNEX-4), CPI (ANNEX-5) and SB3S (ANNEX-6) will be applied.

After the initial data were collected, the students in Experiment 2 will be informed about Laughter Therapy and Group IPT. An agreement will be made with the students about the points to be considered regarding laughter therapy

"Informed Consent Form" and "Voluntary Consent Form" were presented to the students in the placebo group in the first interview and their consent was obtained, "Student Information Form (ANNEX-1)", "CIBS (ANNEX-3)", PCI (ANNEX-4), CPI (ANNEX-5) and SB3S (ANNEX-6) were applied.

The students assigned to G4 will be informed that they are in the control group and that no application will be made. After the completion of the study data (by giving information about Group CIPT and laughter therapy), it will be stated that they can receive Group CIPT or laughter therapy if they wish.

Group KIPT will be 1 session per week and each session will last 90 minutes. There will be 7 sessions in total, and a completion session will be held 2 weeks after the completion of Group KIPT. In order for the students in G1 to understand which group they are in, they will also be informed about the points to be considered regarding laughter therapy. An unstructured laughter intervention will be applied at the beginning or at the end of the sessions in which group IPT is applied.

Measurements will be made using "ANNEX-3, ANNEX-4, ANNEX-5, ANNEX-6" in the 4th week (intervention interval), 8th week (end of intervention) and 12th week (long-term effect). Within the scope of work packages 3 and 4, KIPT application and other measurements will be made.

It is thought that self-reflection plays a mediating role in the interpersonal relationships and problem solving skills of the students in the study. For this reason, it was decided to determine the self-reflection characteristics of the students, but a suitable scale could not be found. Thus, it was decided to develop a scale to determine the self-reflection characteristics of students studying in Health Sciences. In this direction, the scale development study was carried out by obtaining the approval of Istanbul University-Cerrahpaşa Social and Human Sciences Research Ethics Committee (2023/120) and the necessary permission from Istanbul University-Cerrahpaşa Faculty of Health Sciences Dean's Office (06.10.2023-802307).

Problem Solving Inventory was developed by Heppner and Peterson (1982). It was adapted into Turkish by Taylan (1990), Şahin, Şahin and Heppner (1993). The scale is a six-point Likert-type scale consisting of 35 items and three factors. The first of the three factors is problem solving confidence (11 items), the second is problem avoidance/approach (16 items), and the third is control (15 items). Scale options are scored between one and six as "I always behave like this" and "I never behave like this".

Interpersonal Relationship Dimension Scale (IRDS; ANNEX-3): This scale was developed by İmamoğlu and Aydın (2009). The IBS is a 5-point Likert-type scale consisting of 53 items, which is suitable for Turkish conditions, analyses interpersonal relationships and determines relationship dimensions. The scale consists of four sub-dimensions: Consent Dependence, Empathy, Trust in Others and Emotion Awareness.