METHODOLOGY

How Truos courses are built

Every lesson you take on Truos rests on three well-studied ideas from learning science. None of them are new. All three are load-bearing.

ONE

Merrill’s First Principles of Instruction

David Merrill’s 2002 paper is a meta-synthesis — he read a generation of instructional design research and asked what all of it agreed on. The answer was five phases, in order, organized around a real problem:

  1. Activation — surface what the learner already knows (or doesn’t).
  2. Demonstration — show the concept, don’t just describe it.
  3. Application — have the learner use the concept on a realistic task.
  4. Integration — check that it sticks.
  5. Problem-centered — all four steps orbit a concrete problem, not an abstract topic.

Every Truos lesson has five steps in this exact order — Think → Understand → Learn → Apply → Quiz. The step names are ours; the spine is Merrill’s.

Merrill, M. D. (2002). First principles of instruction. Educational Technology Research and Development, 50(3), 43–59.
TWO

Cognitive Load Theory

John Sweller’s work, still a cornerstone of educational psychology, says the same thing every good editor knows: a reader has a fixed amount of working memory. Spend it on the lesson, not on parsing the lesson.

This is what shapes our writing rules: short sentences, one analogy per lesson, no split-attention (no footnotes you have to chase). The voice guide is a load-management spec.

The practical effect: Truos lessons are deliberately 2–3 minutes, not 20. Short enough to finish in the gaps between meetings, dense enough to teach something real.

Sweller, J. (1988). Cognitive load during problem solving. Cognitive Science, 12(2), 257–285.
THREE

Retrieval Practice

Reading a thing is not remembering a thing. Recalling it is. Roediger & Karpicke ran a now-famous 2006 study showing that learners who were tested on material retained 40–60% more of it weeks later than learners who simply re-read it.

Every third Truos lesson opens with a Quick Recall — one question from two or three lessons ago. Every module ends with a Module Recap that interleaves questions across the lessons in that module. We do this because it works, not because it looks thorough.

Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning. Psychological Science, 17(3), 249–255.

See it in action

The first lesson of AI·101 is free, no sign-in required. The five phases are labeled inside the player so you can see the scaffold as you go.

Take lesson 1 free →

None of this is marketing fluff: if you look at the lesson schema in our codebase, the step types are named after Merrill’s phases. The voice rules are written as a style guide every writer checks against. The recall cadence is hard-coded into the lesson player. We built the rails so the content couldn’t drift.