After selecting and determining the number of samples, individuals are by using a table of random numbers are divided into two groups (intervention and control). This means that the evaluator and therapist do not interfere in the placement of samples in any of the groups and their placement in each group will be done only through a table of random numbers. Since we have two groups of intervention and control, the total number of samples should be divided into two groups, the number of both groups will be equal. Therefore before the entrance of patients in the study, the total number of samples is divided into two categories. For example, 80 patient samples are needed to study, divide 80 by two, and place 40 patients in each category. The first group of patients will be the control group and the second group of patients will be the intervention group. Then a number will be randomly selected from inside the table of random numbers in the vertical or horizontal direction. After that, the selection of numbers will continue until the first group ends. For example, in a table of random numbers we have a set of 4-digit numbers that are placed in columns and rows. In one of the rows, select a number and select the numbers in pairs. For example, from 4576, two numbers 45 and 76 will be selected. We will proceed in the same way until the first 40 samples are selected. Then, a number in the vertical or horizontal direction will be selected randomly and in the same order as before (in rows or columns) the selection of numbers will continue until the number of second group samples is determined. After the patients enter, the code will be assigned to the patients in the order of their entrance. After matching that code with the desired number in each of the categories, it will be determined in which group the patient will be placed.