Constructs are abstractions used to explain phenomena or behaviors that cannot be directly observed or measured. Some constructs are discipline-specific like “ego”, “chic”, and” sonorous”. But many constructs developed in the sciences have a shared, common meaning across all domains of knowledge like “evolution”, “force”, “acceleration”, “reaction”, “expansion”, and “exchange”. These are herein called “core constructs” because of their foundational nature.

These “core constructs” are the staples of all scientific discourse and are commonly used in the Arts and Humanities. Their ubiquity and their universal application are what makes them useful as anchoring keywords in this new approach to organizing vast bodies of diverse content. To date, twenty-five core constructs have been identified and validated. It is estimated that there may be as many as 50 to 100 in the English Language. After validation they are used as anchoring keywords in Constructopedia.