[edmundsauto]

Why do you think it's about the subject, and not a reference to our ability to understand the non-linear outputs from a huge number of inputs?

Personally, I believe that psychology could be a hard science if it weren't for the limitations of our tools.

[trashtester]

For now, psychology is too hard (meaning difficult) to be a hard (meaning solid) science.

[edmundsauto]

Exactly! It's about the limitations of our tools, which means as the tools evolve, subjects shift more towards hard science as we understand them better.

It's not a category that is immovable.