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.
At each level, Montessori programs are designed to address the developmental characteristics normal to children in that stage. Montessori classes are organized to encompass a two-or three-year age span, which allows younger students the stimulation of older children, who in turn benefit from serving as role models.