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.
An early, wonderful example of sfumato can be seen in Leonardo's Mona Lisa. Inventing the Technique According to the art historian Giorgio Vasari (1511â1574), the technique was first invented by the Primitive Flemish school, including perhaps Jan Van Eyck and Rogier Van Der Weyden.