If there's one piece of advice I'd give to any debater who wants to improve between tournaments, it's this: build a matterfile.
A matterfile is a living document where you collect arguments, frameworks, examples, and knowledge which you can draw on during prep. Some people call it a "case file" or a "prep doc." The name doesn't matter. What matters is you have one and you actually use it.
When I prepped for Madrid Worlds with my partner Muzzi, our matterfile was around 80 pages. It covered moral philosophy, international relations, economic frameworks, and dozens of pre-prepped arguments on recurring topics. We didn't use all of it. We probably used 30% of it directly. But the process of building it made us sharper, faster, and more confident in prep rooms than we'd ever been.
What goes in a matterfile
There are three layers. Most people only do the first and wonder why their matterfile doesn't help them in rounds.
Layer 1: Arguments and case shells. This is what most people think a matterfile is. You watch a debate on YouTube, you hear a good argument about microfinance, and you write it down. Or you prep a motion and your case on sovereign wealth funds turns out pretty strong, so you save it. This layer is useful but limited. Arguments are motion-specific. If the tournament doesn't set a microfinance motion, that entry sits there doing nothing.
Layer 2: Frameworks and principles. This is where the matterfile starts paying for itself. Instead of just storing arguments, you store the reasoning patterns which generate arguments.
For example, instead of just writing "THS developing nations falsifying history: creates unified identity, enables collective action," you write out the underlying principle: "Developing nations face a collective action problem. Diverse populations with no shared identity lack incentive to cooperate. A unifying narrative, even a constructed one, gives people a reason to act as a group rather than a collection of individuals."
That principle applies to dozens of motions. Nation-building, language policy, immigration, cultural heritage, education curricula. One framework, many applications.
Some frameworks worth having in your matterfile:
State legitimacy and consent. When is a government justified in acting? What makes authority legitimate? When does that legitimacy break down? These questions come up every time a motion involves state power, policing, regulation, or sovereignty.
Utilitarianism and its limits. You should know the standard utilitarian argument (maximize wellbeing for the most people) and its three biggest problems: the repugnant conclusion, the justice objection (killing one to save five), and the demandingness objection (you can never stop sacrificing). These show up constantly in weighing debates.
Identity and self-presentation. People have a right to control how they're perceived. When narratives, institutions, or policies strip that control, the harm is deep and personal. This framework wins rounds on media representation, cultural narratives, minority rights, and immigration.
Structural vs. individual-level analysis. Some problems are best understood as individual choices (someone is lazy, someone made a bad decision). Others only make sense at the structural level (poverty traps, institutional racism, market failures). Knowing when to zoom in and when to zoom out is a transferable skill.
Layer 3: Knowledge base. This is the IR section, the economics primer, the gender politics overview. It's the factual foundation which makes your arguments credible.
You don't need to be an expert. You need enough to sound like you know what you're talking about and to avoid saying something obviously wrong. For international relations, that means knowing the basics of China's foreign policy (Belt and Road, century of humiliation narrative, the Taiwan question), US alliance structures (NATO, bilateral treaties, nuclear umbrella), and how the EU works (sovereignty tensions, common market, enlargement). For economics, know what a sovereign wealth fund is, how monetary policy works, what FDI means and why developing countries want it, and the basic argument for and against free trade.
The goal isn't memorization. It's pattern recognition. When you see a motion about China for the fifth time, you're not starting from scratch. You're applying a framework you already understand.
How to organize it
Keep it simple. The fancier your organization system, the less likely you are to maintain it. Here's what works.
Section 1: Principles and frameworks. Your philosophical and analytical tools. Group by theme (state power, identity, economics, morality). Keep each framework to one paragraph. If it takes more than a paragraph to explain, you don't understand it well enough yet.
Section 2: Topic areas. Your knowledge base, organized by region or subject. IR goes here: China, US, EU, Middle East, Africa. Economics goes here: development, trade, labor. Social issues go here: media, gender, criminal justice.
Section 3: Case shells. Organized by motion type or topic. These are the specific arguments and cases you want to remember. Each entry should include the motion, the side, and a brief outline of the argument (problem, mechanism, impact). Don't write full speeches. You want enough to jog your memory in a prep room, not a transcript.
How to actually build it
Don't try to write 80 pages in a weekend. It'll be bad, you'll burn out, and you won't use it. Build it gradually.
After every tournament, add 2-3 things. A case which worked. A framework you wish you'd had. A piece of knowledge you were missing when you needed it. This takes 20 minutes.
After watching debate videos, grab anything good. Hear an argument about the Responsibility to Protect which explains collective action mechanisms in a way you hadn't considered? Write it down. Not their exact words: your version, in your own framing.
Once a month, review and prune. Delete anything you've never looked at twice. Sharpen entries which are too vague. Move arguments which keep recurring into a framework entry instead of keeping five versions of the same idea.
How to use it during prep
This is where most people go wrong. They bring their matterfile to the prep room and try to copy-paste arguments. Don't do this.
Use it before the tournament. Read through it the night before. Refresh your memory on frameworks and knowledge areas. This primes your brain so you can recall things naturally during prep.
During prep, use it as a spark. If you're stuck on a motion, glance at your frameworks section. Does a principle apply? Does a knowledge area give you an example you hadn't thought of? The matterfile isn't a script. It's a starting point.
Never read from it during a speech. If you're reading from your matterfile in a round, something has gone wrong. The arguments in your matterfile should be familiar enough that you can explain them from memory, adapted to the specific motion. Reading sounds like reading. Judges notice.