Outlines the journey from shallow to deep learning. SOLO is the taxonomy chosen by John Hattie and is currently studied in depth at his Visible Learning Labs (Osiris Educational Outstanding SOLO 1: “The Pre-Structural Level” Here the student has no understanding whatsoever but uses irrelevant information and/ or sparse information may have been acquired, but it is unorganized, unstructured, and essentially devoid of actual content or relationship to a topic or problem.ONLY 2: “The Uni-structural.