What the heck is constructivism?

One of the terms which most has troubled me to really catch in is constructivism.

I have been trying to collect all the necessary conditions which define a particular phenomenon as an instance of constructivism.

By now, this is my collection:

1. Coercion. Constructivism in order to be relevant as a social phenomenon has to imply the violation of formerly defined rights of property. Merely defining in my mind an utopia is not constructivism. It is not even if I establish a campaing to persuade other people to voluntarily adopt my utopia. It is not constructivism when I plan a Victorian styled village inside my land and convince other people to buy a house there. I am simply entrepreneurly guessing a demand for Victorian styled villages.

And that's all. If the presence of intention or planning would be the characteristic feature of constructivism, every single human action would have to be deemed constructivist. So, it should be clear that intentionality per se doesn't necessarily implies constructivism.

Neither give I a damn for the praxeologic pertinence of identifying either animism (purposes of the things themselves) or artificialism (purposes of the makers of the things) as influences of specific human actions. These categories are maybe interesting for the thymologist but certainly not for the praxeologist.

So, I don't see any relevance whatsoever in the use of the term constructivism as something essetially distinct from coercion. To me, constructivism is a quite useless concept.