A didactical situation is a set of explicit or implicit relationships established between a student or a group of students, in a certain milieu, possibly comprising tools and objects, and an educational system (the teacher) to enable students to access built or under-construction knowledge.
This could be attributed to the methods of instruction used.
As a result, maths teaching methods must be reconsidered in light of the these three major learning theories: behaviourism, cognitivism, and constructivism.
A field of research that aims at studying the theory and methods of learning the discipline.
The Toolbox: Objects and Tools for Doing Mathematics.