One question, answered from the books
How do I identify my win condition in League of Legends?
A win condition is the thing your team actually wins through, named early and played toward while you ignore the noise. It isn't the same question as who's fed. Read it in three steps: name their biggest threat, name your answer to it, then name the path your composition converts. Scaling, side pressure, objective control, front-to-back, pick, protecting one carry, or ending before their scaling arrives; one of these covers almost every game. Once it has a name, every decision on the map either serves it or costs it.
The decision, as a picture
What it looks like in a real game
Their Katarina is 5/0 at fifteen minutes and your team wants to surrender. The threat is named; now name the answer. Your support has three forms of crowd control, your side has a Kassadin, and their second-best player is 0/3. So the win condition reads: survive mid game without feeding her resets, hold the crowd control for her, and drag the game to the minute where Kassadin outscales the whole map. The team that plays toward a named condition beats the team that plays toward the kill feed.
The concept: threat, answer, win condition
Why three reads, and why in that order? Because the first two make the third honest. The threat read keeps you from picking a win condition their composition simply deletes. The answer read tells you which of your resources can't be spent anywhere else. Whatever survives both reads is a condition you can actually play toward, and The Sovereign Jungler's rule is that you keep reading it; a win condition is a live document, and the game will contradict your draft of it.
"Your win condition must follow the actual game, not the game you assumed you were playing."
"Update your win condition in real time."
Watch this read in a live Challenger game
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In this video: A live Challenger game narrated around this exact read: naming both teams' win conditions in real time, adjusting the call as the game moves, and pointing out what it looks like when a team plays as if it doesn't have one.