Five requirements for scientific rigor

From Why psychology isn't science by Alex B. Berezow, a nice succinct definition of the essential attributes of the scientific method.

That's right. Psychology isn't science.

Why can we definitively say that? Because psychology often does not meet the five basic requirements for a field to be considered scientifically rigorous: clearly defined terminology, quantifiability, highly controlled experimental conditions, reproducibility and, finally, predictability and testability.

Convert it to a checklist. When someone says something is real/true/scientific, then one is right to ask whether it has all these attributes:

Clear and unambiguous definitions of critical terms

Clear and comprehendible measurements

Clear, transparent and documented methodology of experimentation or data collection

Results replicated by independent and disinterested parties

Concrete, measurable predicitions of novel outcomes that can be tested as to their veracity