Randomization:
Step 1: Random sequence generation: Considering that the researchers of this study tend to have all sample groups with equal sample size, they used restricted randomization. In the present study, the method used in this type of randomization in order to create a balance in the number of samples assigned to each of the studied groups is block randomization. The placement of family caregivers of the elderly with several chronic diseases in two groups of intervention (reality therapy) and control (without intervention) was done by block random allocation method. The method of assigning 50 eligible samples to two groups of 25 is as follows: the method of 4 random blocks is used to assign family caregivers to the four groups studied. To do this, first write a list of blocks and assign numbers to them {(1) AABB- (2) ABAB- (3) ABBA- (4) BBAA- (5) BABA- (6) BAAB}. Then, using a table of random numbers, 13 random numbers between 1 to 6 are created and according to the mentioned numbers, the relevant block is selected and a random sequence is formed as a sequence of letters A and B (letter A for the test group and letter B for the control group).
Step 2: Concealment of random allocation: To perform a random sequence on the study participants, Sequentially numbered, sealed, opaque envelopes are used. In such a way that the assigned group is not specified before the individual is assigned; A number of envelopes are prepared and each of the random sequences created is recorded on a card and the cards are placed inside the envelopes in order. In order to maintain a random sequence, envelopes are numbered in the same way on the outer surface of the envelopes. Finally, the lids of the letter envelopes are glued and placed inside the boxes, respectively. At the beginning of the registration of participants, one of the envelopes of the letter is opened and the assigned group of the participant is revealed, according to the order of entry of the eligible participants.
Step 3: Execute the random allocation process: The student examines the participants in terms of inclusion and exclusion criteria in the study and registers them in the study. However, the person who assigns the participants to the groups will not be involved in the intervention and data collection of the participants.