A data model explicitly determines the structure of data. Data models are specified in a data modeling notation, which is often graphical in form. A data model can be sometimes referred to as a data structure, especially in the context of programming languages. Data models are often complemented by function models, especially in the context of enterprise models.
The Association Montessori Internationale (AMI), founded by Maria Montessori in 1929, maintains Montessori educational principles and disseminates Montessori education throughout the world.
Montessori noticed that there were certain periods of particular sensitivity that kept occurring in the children. During these periods the child could learn the activity that she was focused on at a particularly intense rate and that such learning appeared to come very easily.