The Idea of a Unit - More About

The Early Numeracy Research Project (ENRP) described the development of the concept of length as including:

• Awareness of the Attribute,
• Comparing,
• Quantifying, and
• Measuring.

In the literature, it is common to describe the key stages as:

• Conservation,
• Transitivity,
• the Idea of a Unit and
• Iteration.

This development is what the Early Numeracy Research Project described as Quantifying, and what others have described as the Idea of a Unit and Iteration.