Carl Hendrick Profile picture
Jan 11, 2024 8 tweets 4 min read Read on X
Direct or explicit instruction seems to be widely misunderstood. It's often characterised as boring lectures with little interaction and not catering to the needs of all students. Nothing could be further from the truth. A short thread 🧵⬇️
Direct Instruction (DI) as a formal method was designed by Siegfried Engelmann and Wesley Becker in the 1960s for teaching core academic skills. This was a structured, systematic approach which emphasizes carefully sequenced materials delivered in a clear, unambiguous language with examples.

It's designed to leave little room for misinterpretation and to ensure that all students, regardless of background or ability, can learn effectively.

It's also anything but boring. Here is a video from the 1960s of Englemann teaching Maths. Notice how interactive and fast paced the teaching is:
In the 1970s, Barak Rosenshine researched what makes for high quality teaching. He found that really effective teachers use direct instruction (di) as a core part of their practice and that it's about a lot more than merely explaining things ⬇️
In the 1980s, Brophy and Good looked at the relationship between teacher behaviours and student achievement. They found that explicit instruction was an integral part of effective teaching and it was in fact, a form of active teaching. They write that although there is a lot of teacher talk, most of it is "academic rather than procedural or managerial and much of it involves asking questions and giving feedback rather than extended lecturing." edwp.educ.msu.edu/research/wp-co…Image
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In the early 2000s, Explicit Direct Instruction (EDI) was developed by Silvia Ybarra and John Hollingsworth and despite the harsh sounding name, is very interactive.

Something which will probably shock most teachers is that Explicit Direct Instruction suggests that teachers talk for a maximum of two minutes before engaging students in some way ⬇️Image
One major misconception is the claim that "Direct or Explicit instruction marginalises SEN pupils." This is completely untrue, in fact the opposite is probably more accurate. The EEF recommended explicit instruction as a core part of their ‘Special Educational Needs in Mainstream Schools’ guidance report.Image
What is the evidence base for direct or explicit instruction?
Well there's a lot but let's take the unfortunately named Project Follow Through, (initiated in 1968 and extended right through to 1977) which was the largest and most comprehensive educational experiment ever conducted in the US. Its primary goal was to determine the most effective ways of teaching at-risk children in kindergarten through third grade.

The results indicated that Direct Instruction was the most effective across a range of measures, including basic skills, cognitive skills, and affective outcomes.Image
Two astounding things I find about Project Follow Through:

1. Not only did these students (mostly disadvantaged and at-risk) do better on what was termed 'basic skills' such as reading and maths but they also felt better about themselves.
2. Secondly, many educationalists and academics not only ignored these results but actually encouraged schools to use the least effective methods from this study. As Cathy Watkins puts it: "The majority of schools today use methods that are not unlike the Follow Through models that were least effective (and in some cases were most detrimental)."
nifdi.org/research/esp-a…Image

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More from @C_Hendrick

Dec 31, 2025
Working on instructional invariants today and the idea that evaluability is far more important than feedback. In fact, feedback is not an invariant at all.🧵
An instructional invariant is a non-negotiable design condition that must hold for learning to occur reliably.

If violated, it causes learning to fail. Even if everything else appears to be working.

Instructional invariants are constraints on learning environments that prevent predictable failure modes.

They are not a theory of learning. They are a diagnostic tool for design.
Feedback is something the system does. Evaluability is something the learner does. There's a massive difference between the two.
Read 12 tweets
Dec 29, 2025
Reading 'A Pattern Language' by Christopher Alexander and it’s just blowing my mind. His ideas have so much to offer instructional design 🧵 Image
A “pattern” isn’t a recipe. It’s a constraint that, if violated, makes the design fail no matter how pretty the surface is. A room can be any style, but violate “Light on Two Sides” and it will feel gloomy anyway. Image
This is a big lesson for instructional design: you can have the slickest UX, the funniest characters, the best “personalisation" etc but if you violate learning constraints, the product won’t teach. It will just entertain.
Read 9 tweets
Dec 13, 2025
Not everything is worth retrieving. Retrieval practice is powerful, but only when it targets the right knowledge. 🧵Image
As a general rule, knowledge that's central to the discipline should be retrieved.
Threshold concepts:
- Opportunity cost in economics
- Evolution by natural selection in biology
- The concept of a limit in calculus
- Irony in literature.
Hinge points:
A moment in instruction where everything that follows depends on students having grasped what came before. It's the juncture where the lesson either consolidates or collapses. If students haven't understood the concept at this point, proceeding is futile.
1. Retrieve knowledge that future learning depends on.
Example: In maths, fluent retrieval of place value and number bonds underpins everything from fractions to algebra. If students cannot retrieve these instantly, problem solving is a struggle.
Read 8 tweets
Oct 13, 2025
Vygotsky's 'Zone of Proximal Development' is perhaps the most misunderstood idea in education. It was never a teaching method but a metaphor for how teaching can pull thinking upward, from the everyday to the scientific. ⬇️ 🧵Image
There are, broadly speaking, two Vygotskys.
The Anglo-American Vygotsky is social, collaborative, constructivist. Born in Mind in Society (1978), he became the patron saint of progressive education and appears alongside Bruner, Piaget, Rogoff, and Wertsch in teacher education courses.
His classroom privileges dialogue, peer tutoring, and scaffolding. He advocates discovery learning, group work, and authentic tasks. The teacher steps back.
Read 14 tweets
Sep 23, 2025
Really interesting new paper on using 'contrasting erroneous example' as a means of preventing common misconceptions.
The worked example effect shows that novices benefit from step-by-step clarity, while this paper suggests that once some foundations are in place, contrasting erroneous examples can push learning further by clarifying boundaries.Image
Again I'm reminded of Theory of Instruction here and the idea that we learn what something is by contrasting it with what it isn't.Image
The crucial thing here seems to be prompts and the specific operators they use (explain, reflect, describe) which determine whether students engage in generative learning or mere recognition. Image
Read 9 tweets
Aug 3, 2025
Not all wrong answers are equal. I used to think students just needed the right information to fix misconceptions but then I read the work of Michelene Chi🧵⬇️ Image
Chi’s research revealed that misconceptions are not just small knowledge deficits; they are often coherent yet incorrect frameworks of understanding.

Put simply, a student’s wrong answer can stem from a well-formed but fundamentally flawed theory about how something works, rather than from a simple factual mistake.
So a student’s wrong answer might be the right answer according to their internal model. That’s the problem.
Read 16 tweets

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