Participants
RECRUITMENT
Study participants were women who immigrated to Korea from China, the Philippines, and Vietnam to marry Korean men and who currently have children aged 0–6. We recruited participants who had visited Multicultural Family Support Center (MFSC). To be eligible to participate in the study, women had to own an Android smartphone and have the ability to download and use the mobile application. The study participants then had to agree to not participate in another early-childhood healthcare program during the intervention period.Since social welfare services for marriage migrant women who move to Korea are mainly delivered through MFSC, most marriage migrant women use the MFSC. Therefore, this study recruited subjects through the MFSC. There are thirty-eight MFSC in three adjacent metropolitan cities, and we used the RANDBETWEEN function in Microsoft Excel 2010 to randomly assign three centers for each of the three study groups. According to the power calculation using G-power 3.1.9.2, the minimum number of participants needed was 54 women, 18 individuals in each group. However, we considered that a similar study conducted in the past had the dropout rate of 40% (Recruitment of the program.Process of program development base on ADDIE model.