**4. Numeric Example**

Children's care always has been the focus of governmental institutions since early childhood education is recognized as the basis for lifelong learning and development. Nowadays, kindergartens not only provide childcare but also perform protective, emotional, socializing, and educational functions [58]. Since parent's contribution to their child's education is increasingly growing, parental opinion and understanding of the kindergarten quality is becoming an important topic. Besides, a clear understanding of parents' opinions might help public authorities not only to improve the provision of services but also to ensure proper distribution of the public investments. Since organizing of the parental meetings is a time-consuming and human-intensive process, online surveys are the easiest way to find out what parents think.
