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by Jacquass12321 5368 days ago
Experience really, but the key is the granularity of the requirements. The more well defined the project scope is the easier it is to estimate and the closer I find my estimates to be. The more information you can get out of the client about what they want the more accurate any estimate is going to be. I would never let myself get tied to any quote that wasn't made for a specific set of requirements.