Cognitive development, complexity, and how thinking grows

What Is Cognitive Complexity? Cognitive complexity is how many ideas and relationships a person can coordinate when they reason. It develops in stages, predicts real outcomes, and can be trained. 9 min read · 8 sources → The Model of Hierarchical Complexity, Explained The Model of Hierarchical Complexity (MHC) defines developmental stages by structure, not age. A plain-language guide to how it works and why it matters. 10 min read · 5 sources → Bloom's Taxonomy vs the Model of Hierarchical Complexity Bloom's Taxonomy classifies types of thinking tasks. The Model of Hierarchical Complexity measures their difficulty. Here is how they differ and when to use each. 9 min read · 4 sources →

Critical Thinking Skills: How to Measure and Develop Them Critical thinking is a set of teachable cognitive skills, not an innate trait. What the research says about defining it, measuring it, and developing it for transfer. 10 min read · 5 sources → How to Teach Critical Thinking: A Classroom Playbook A practical, evidence-based playbook for teaching critical thinking that actually transfers: what to do, what to avoid, and what the research supports. 10 min read · 5 sources → Metacognition: Teaching People to Think About Their Thinking Metacognition is thinking about your own thinking. It is one of the highest-leverage, most teachable capacities in education, and the evidence behind it is strong. 9 min read · 5 sources → Cognitive Load Theory: Why Working Memory Is the Bottleneck Cognitive load theory, developed by John Sweller, explains why working memory limits learning and how to design instruction that respects it. A practical guide. 11 min read · 7 sources → Growth Mindset, Revisited: What the Evidence Actually Shows Growth mindset became a phenomenon, then a replication debate. What the meta-analyses really show, who it helps, and how it fits with developing real cognitive skill. 11 min read · 6 sources →

The Skills That Matter When AI Can Write the Answer When AI can produce the answer, the value shifts to judging it. The data on which human skills are rising, and why cognitive complexity is the one that compounds. 10 min read · 6 sources →

Adult Cognitive Development: Why Thinking Keeps Growing at Work Cognitive development continues well into adulthood. The research on adult stages, how they shape leadership and work, and why most people plateau without challenge. 10 min read · 5 sources → Robert Kegan's Stages of Adult Development: A Practical Guide Robert Kegan's theory of adult development describes how the mind grows through orders of consciousness. A plain guide to the stages and what they mean at work. 10 min read · 3 sources → Hiring for Thinking: How to Assess Cognitive Complexity in Candidates Resumes show what a candidate knows. They hide how a candidate thinks. A guide to assessing cognitive complexity in hiring, and why it predicts performance. 11 min read · 4 sources →

Assessing Thinking, Not Just Knowledge Most tests measure recall. They miss how a person reasons. A guide to cognitive diagnostics: what they measure, how, and why it matters more in the AI era. 10 min read · 4 sources → Why Standardized Tests Miss the Most Important Thing Standardized tests measure whether the answer was right. They are largely silent on how a student thinks. Here is what they miss, why, and what to measure instead. 9 min read · 4 sources →