In this study, simple randomization method is used to assign participants to two experimental and control groups. The randomization unit in this study is married women who are referred and eligible for the study. First, a complete list of volunteers who have been selected based on the study entry criteria is prepared. Then, each participant is assigned a unique numerical identification code. These codes are entered into the Random Number Generator software and a random number from one to 30 is generated for each individual. After generating these numbers, the participants are sorted in order based on the value of the random number and the individuals are assigned to two groups. The first 15 people on the list are assigned to the experimental group and the next 15 people to the control group, respectively. With this method, the order of entry into the study and the researcher's knowledge of the participants will not play any role in determining the group. To ensure allocation concealment, the person responsible for entering data and performing the randomization process in the software will be independent of the intervention administrators and study evaluators and will not have access to information about the session implementation process or changes in the allocation of individuals. Participant identification codes will also be kept confidential and separate from their other personal information. Therefore, it will not be possible to predict the assigned group for each participant before the randomization process.
In order to control bias and improve the internal validity of the research, this study will be designed with a double-blind approach; in this way, the outcome assessor and data analyst will be kept unaware of the allocation of students to the experimental and control groups. In this process, the outcome assessor will collect and record data at all stages of the pre-test, post-test, and, if the follow-up stage is implemented, without knowing the assigned group of the participants, in order to reduce the possibility of bias in measuring the self-confidence and stress variables. Also, the raw data of the participants will be provided to the statistical analyst using anonymous codes, such as Group 1 and Group 2, and the true nature of the groups will not be revealed until the end of the data analysis process. All stages of assigning participants to the experimental and control groups will be carried out by an individual independent of the intervention implementation team, and the assignment codes will be kept confidential. The decoding of the group codes will only be done after the final completion of the statistical analyses. Accordingly, by reducing the evaluator's and analyst's awareness of the participants' group status, an attempt will be made to minimize the possibility of bias in data collection, recording, and analysis and to increase the validity of the research results.