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
Image
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

Aug 3
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
Jul 24
What is the effect of giving children smartphones before the age of 13? It's bad. Strongly associated with poorer mental health and wellbeing. BUT the evidence is largely correlational. What does this mean? 🧵⬇️ Image
A new global study of over 100,000 young adults found that receiving a smartphone before age 13 is associated with significantly poorer mental health outcomes in early adulthood, particularly increased suicidal thoughts and diminished emotional regulation, with effects primarily mediated through early social media access.
The research demonstrates a clear dose-response relationship: the younger children are when they receive smartphones, the worse their mental health outcomes as young adults. Females who received smartphones at ages 5-6 showing 20 percentage points higher rates of suicidal ideation compared to those who received them at 13.
Read 15 tweets
Jul 23
"Learning facts is going to fade into the background." 🤦‍♂️
Quick thread on why this is a terrible take🧵⬇️
For whatever reason, the idea of knowing stuff has become unfashionable. We’ve absorbed the idea that facts are “mere” details, that skills and dispositions matter more, and that technology makes memory unnecessary.
But knowledge isn’t obsolete, it’s the precondition for reasoning, creativity, and insight. Skills divorced from knowledge are empty performances.
Read 11 tweets
Jul 20
Expertise isn't about having more working memory, it's about needing less of it. Experts automate many components in long-term memory and can recognise meaningful patterns instantly, bypassing the need to process individual elements. ⬇️ 🧵
For example, the multiplication tables aren't memorised for their own sake, but because automated arithmetic facts free working memory for algebraic reasoning.
Phonics isn't taught to create little robots, but because automated letter-sound correspondences liberate the cognitive resources necessary for comprehension and analysis.
Read 10 tweets
Jul 3
New study: A single 10-minute retrieval practice activity significantly improved final exam performance compared to a review session. But there's a lot more to this study 🧵⬇️ Image
The intervention was 10 minutes of students taking an unexpected, closed-notes practice test consisting of:
- 10 multiple-choice questions created by the instructor
- Questions focused on key concepts likely to appear on the final exam
- Each question had four answer choices
- Questions assessed recall or comprehension of foundational concepts

Students were told it was ungraded and framed as preparation for the final exam. Immediately after the 10-minute test, the instructor provided corrective feedback, explaining why each answer was correct or incorrect.
The passive review was a brief PowerPoint-based presentation where the instructor delivered key concepts as bullet points to the class. Specifically, the review group received:

The same content that was tested in the retrieval practice group
Information presented in bullet-point format on slides
Instructor clarification of misconceptions
A structured overview of concepts likely to appear on the final exam

This is what the study calls a "more common instructional approach"; essentially a traditional pre-exam review session where students passively receive information rather than actively retrieving it from memory.
Read 9 tweets
May 4
This new paper is a great example of desirable difficulties in practice: Interleaving spelling tasks led to better performance on later spelling tests, even though it was harder during practice. 🧵⬇️ Image
What is interleaving and how does it work? Essentially it's really about a kind of discrimination: when learners encounter different items back-to-back, they must pay attention to what distinguishes one from the next. This strengthens their ability to categorise and apply the right rule or strategy.

Interleaving stands in opposition to "blocked practice", which is when learners focus on one type of problem, skill, or concept at a time and repeating it over and over before moving on to the next.Image
The key thing to understand about interleaving is that it leads to poorer performance in the short term, BUT better learning in the long-term.

While blocked practice can feel easier and lead to better short-term performance, it often results in poorer long-term retention and weaker transfer because it doesn’t require learners to distinguish between different types of problems or rules.Image
Read 12 tweets

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