This is part of a series of introductory articles. Which explain basic concepts of competitive debating. It is followed by "Judging Competitive Debating - Part 2 - The process of judging."
I am indebted to the wonderful David Bender for the first part of this explanation, I was going to write one myself but his is sufficiently good and concise that would seem like a waste of time:
I am indebted to the wonderful David Bender for the first part of this explanation, I was going to write one myself but his is sufficiently good and concise that would seem like a waste of time:
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[Judging] is a 'comparative assessment of each team's persuasiveness'.
It's comparative, insofar as you compare teams: there is no absolute standard of persuasiveness a team has to beat.
It's team-based, insofar as you have to judge the whole team.
We know that three things make a speech persuasive: content, analysis and style. If a speech contains all three of those things, it is persuasive.
Content means attempting to prove things relevant to your side winning. You can choose content - so pick what path you want to take to proving your side. However, other teams can challenge you to provide content: 'demonstrate this is legitimate'. Look to see what metrics teams set themselves, and what metrics are set by other teams.
Analysis means explanation. Specifically, an idea is well analysed if teams explain why it is true, and why it is important. Analysis can be thick or thin. Thick analysis is well explained with each logical step explicated. Thin analysis is poorly explained with many missing steps. Analysis can be broad or narrow. Broad analysis contains many independent logical chains to prove a claim. Narrow analysis contains just one. Broad, thick analysis is most persuasive.
Style means you can understand what they say. If what they said is confusing, it cannot be credited.
If a speech fulfills its relevant burdens, in a well analysed and stylistically clear manner, more so than other teams, that team wins.This framework works well for most university level competitions, but might be harder to apply in novice and schools competitions where arguments may not be made as clearly and may not explicitly clash with each other. (I’ll probably write a more detailed post on this in the future).
A few additional notes:

