The Stages of Game Development
Tutorial
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Beginner
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+10XP
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10 mins
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(164)
Unity Technologies

It's a long journey from idea to completed game, and every project has its surprises and setbacks. Professionals keep a sense of the big picture by dividing the process into stages and milestones.
1. Pre-Production
2. Why Milestones?
3. Game Development Cycle
Here’s a clear, concise overview of the game-development lifecycle: CG Spectrum’s “How Video Games Are Made: The Game Development Process”.
This is a very good description of a vertical slice with a simple example.