Big DI and little di

When I talk about Direct and Explicit Instruction, I try to emphasize an important distinction.

• Big DI refers to Direct Instruction (capital D, capital I): the Engelmann-designed, scripted, highly validated programs with decades of research behind them. These programs are precise, carefully field-tested, and engineered so that success is the default outcome.

Big DI is the complete package – the system, materials, and assessments. I taught my daughter to read with Big DI. I taught middle schoolers math with it. I have a podcast about it.

• little di is what many educators refer to as “explicit instruction”: systematic teaching practices like modeling, guided practice, checking for understanding, and brisk pacing.

little di captures the habits of the most effective teachers. It isn’t a program – it’s a set of general principles. Obviously, there are challenges with this (See: The Truth About Lesson Planning.)  

Here are two resources that show both sides in action:

DI Voices

My contribution to the Direct Instruction community, highlighting the depth and design of Engelmann’s model.

Explicit Instruction in Math

My sessions from the PaTTAN Math Conference, where I advocate for a shift away from constructivist approaches in math, and share “little di” practices teachers can use with their students.

I hope you find these useful.