Teaching and Doing

AlphaGo didn't just beat humans—it changed how we understand Go. AI coding agents will do the same to software development, if we let them.


Move 37 Coding

In 2023 I sat down with Aaryaman Patel and Juan David Campolargo Hoyos for a five-hour conversation that touched on education, life, meaning, and everything in between.


UIUC Talkshow Interview

Breaking large courses into smaller pieces doesn't make them better. It can easily make them worse.


Divide and Blunder

Live teaching demonstrations are an ineffective way to interview teaching faculty. There's a better approach.


Ditch the Demo

Large university courses must and can be better. But they also fail in predictable ways, negatively affecting large numbers of students.


Large Courses Should Be Better

When the pandemic hit, we scrambled to create an effective approach to providing one-on-one support online. The process also led me to some insights about help site design, community building in CS1, and possible paths towards increasing diversity in our field.


A Help Site Story

There's a ton of variation between teaching faculty positions. If you want a good one, here are some additional important questions to ask, related to teaching assignments, broadening participation, and institutional support.


Evaluating Teaching Faculty Positions: Part 3

Commitment to Broadening Participation in Computing

There's a ton of variation between teaching faculty positions. If you want a good one, here are some additional important questions to ask, related to contracts, pay, and leadership opportunities.


Evaluating Teaching Faculty Positions: Part 2

Contract Length and Security of Employment

There's a ton of variation between teaching faculty positions. If you want a good one, here are some of the important questions to ask.


Evaluating Teaching Faculty Positions

How and why we run untrusted Java bytecode in a secure in-process sandbox. (tl;dr: It's fast.)


The Need for Jeed

A single exam isn't the solution to assessment. It's the problem.


Eliminate Final Exams

I've created an interactive, immersive, and effective online learning experience for my CS1 students. As the first installment in a multi-part series, I'll provide an overview of my course infrastructure, and discuss a bit about how I got to this crazy place.


My CS1 Backend

In today's advertures in maintaining your own CS1 infrastructure, how Windows line endings and a persistent student combined to bring down our entire homework grading backend.


Windows Line Ending

In Fall 2021 we began offering Kotlin as a language option in my CS1 course. Kotlin has proven to be a great choice, and represents a substantial improvement over other popular options like Python and Java.


CS1 in Kotlin

Natural Progression from Blocks to Functions to Classes

Minimizing Frustration: Pythonic Clarity, Java's Type Safety

Support for Multiple Programming Paradigms

Grade uncertainty represents the amount of uncertainty students have about how they are doing in a course. Reducing grade uncertainty has proven positive in my courses, even if it has had some interesting side effects.


Grade Uncertainty

Why are college courses structured so differently from classes in high-school? And does introducing more structure help our students learn better?


Poorly Structured

Nothing has been more transformative for my CS1 course than frequent computerized assessments. Including programming questions on weekly proctored quizzes keeps students on track while also helping support many other unproctored assessments. Initially facilitated by an on-campus testing center, we've now successfully transitioned that component of the course online. I'll talk about how and why to use computerized assessments in CS1.


Computerized Testing for CS1

Finding ways to measure success or failure is important when teaching any course, but particularly when teaching CS1. I outline five metrics that I use to evaluate CS1, describe how and why to collect them, and present results from my own course.


Quantifying CS1

What and who is the course trying to teach?

What performance gaps exist between different cohorts?

Not every course needs a community. But I've found that building one among my course staff has made my course both more effective for students and rewarding for myself. Here's how and why we create community in CS1.


Creating Course Community

Teaching large courses can have enormous impact. But it's easy for an instructor's effectiveness to decrease as the number of students grows. The trick to avoiding this is to focus on the things that benefit all students—one for all—and avoid those that only benefit a few students—all for one.


One For All

Programming is a skill, and if you want students to get better at it, you need to encourage them to practice. A lot. But also discourage them from focusing too much on quality too early.


Quantity Over Quality

Piazza is not a forum. It doesn't build community, and it's design goals are oriented around enabling students to extract answers from course staff without engaging in the dialogue that builds understanding. If you are still using Piazza, please consider other much better alternatives.


Why I Don't Use Piazza

With the pandemic seemingly drawing to a close, at least in the United States, it's disappointing to see university students, administrators, and even instructors longing to return to outmoded and ineffective instructional methods. It's not just a return to classrooms. It's a return to lecturing, which we know doesn't work.


Chalkface Nostalgia

Recipe programming comprises working of a set of instructions to produce a program that achieves some desired outcome. While recipe programming is powerful and useful, it should not be confused with teaching the basics of programming, particularly when teaching introductory computer science courses.


Hi, I'm Geoff

Essays

Latest

2026-03-05: Teaching and Doing

2026-03-01: Move 37 Coding

2025-08-25: UIUC Talkshow Interview

2024-07-05: Divide and Blunder

Random Selection

2024-03-21: Ditch the Demo