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Possible Duplicate:
When should one add another answer instead of editing one's already posted?
Users are discouraged from treating SO like a forum and it is expected that one would update and improves his only answer instead of posting a new one. So why is it possible to add a second answer? Has anyone seen a question in which multiple answers by same user have been better than a single updated one?
"Never say never", that's a fitting phrase here.
Although usually you're correct and it's not a good idea for the same person to post two different answers, there are "edge cases" that do justify this.
For example if someone came with two different solutions to the same problem: each solution is on its own, each with its own upsides and downsides, and both solving the problem/question 100%.
Posting each as new answer is better practice as it allows the community to rate each solution independently.
Can't find any example right now, but I'm pretty sure such things exist already.
Preventing users from adding multiple answers would result in:
Both are not desired.
Sometimes you just have several answers to the same question, for example:
Those multiple answers can be found by looking at the answer count (when more then one) which is added to the question title in the user profile answer summary:
