**I'm assuming we're going to have challenges on this site:**

* [Given two hourglasses, one lasting 4 minutes, and one lasting 7 minutes, how do you measure 9 minutes precisely?](http://area51.stackexchange.com/proposals/45128/puzzling/45314#45314)
* [X mile desert crossed by camel, carrying bananas. Camel eats 1 banana per mile. Can carry up to Y bananas. Of Z bananas, how many can I take? Explain.](http://area51.stackexchange.com/proposals/45128/puzzling/45315#45315)

Generally, on other challenge-related StackExchange sites, such as [Programming Puzzzles and Code Golf](http://codegolf.stackexchange.com), challenges are meant to be won. If we are going to post challenges, we will have to decide if and how challenges can be won. Therefore, I think we should have some tags describing the challenge type and scoring involved:

**Types of challenges:**

* [puzzle](https://puzzling.stackexchange.com/questions/tagged/puzzle "show questions tagged 'puzzle'") - A generic challenge that can have multiple answers.
* [open-ended](https://puzzling.stackexchange.com/questions/tagged/open-ended "show questions tagged 'open-ended'") - This is used when there are too many possible solutions for one to be right.
* [one-solution](https://puzzling.stackexchange.com/questions/tagged/one-solution "show questions tagged 'one-solution'") - There is only one possible solution to the challenge.
* [questionable-solvability](https://puzzling.stackexchange.com/questions/tagged/questionable-solvability "show questions tagged 'questionable-solvability'") - Used when the OP doesn't know weather the challenge *can* be solved.
* [community-answer](https://puzzling.stackexchange.com/questions/tagged/community-answer "show questions tagged 'community-answer'") - In challenges with many parts, different members can work together on different parts.

**Ways of scoring challenges:**

* [shortest-solution](https://puzzling.stackexchange.com/questions/tagged/shortest-solution "show questions tagged 'shortest-solution'") - If there are multiple possible solutions, the shortest submission wins.
* [challenge](https://puzzling.stackexchange.com/questions/tagged/challenge "show questions tagged 'challenge'") - The OP gets to choose an answer as the winner. Not very objective, but it can be applied to challenges that can't be scored another way.
* [no-winner](https://puzzling.stackexchange.com/questions/tagged/no-winner "show questions tagged 'no-winner'") - No one wins, this challenge was posted as an excersise and nothing more.
* [popularity-contest](https://puzzling.stackexchange.com/questions/tagged/popularity-contest "show questions tagged 'popularity-contest'") - The answer with the most upvotes by a set time wins.
* [first-submission](https://puzzling.stackexchange.com/questions/tagged/first-submission "show questions tagged 'first-submission'") - The first correct answer wins. This is highly unfair to people who live in different timezones, and therefore highly discouraged.
* [community-answer](https://puzzling.stackexchange.com/questions/tagged/community-answer "show questions tagged 'community-answer'") - Nobody would win these because everyone participates.

I want some community input on this.