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The most important aspect of a question, is always the answer. We may all have questions, but most questions here are not of the philosophical or rhetorical kind, hence without an answer, the question is not particularly useful. 

This is the practical answer to why we enforce duplicate closure on Codidact; it's better to gather the answers in one location, and send everyone there.

Questions do not have to be the exact same in order to be considered a duplicate. Different questions can sometimes have the exact same answer. If that is the case, they are considered duplicates. In the same way, very similar questions aren't necessarily duplicates, because they may have different answers.


### Cross-community duplicates

Sometimes a community receives a question which is already answered elsewhere on Codidact. The scope of whether or not a question is a duplicate, is not just limited to a single community. However, it's important to take into account the community in which a question was posted in. Sometimes, a rather similar question will have a different answer based on which community it belongs to. For example, a question asking for an interpretation of a specific religious text, will have a different answer based on which religious community it was posted in, as it's looking for the viewpoint or interpretation with that specific religion's aspects in mind. Therefore, not all questions are cross-community duplicates despite their similarity. With another example in mind, the same request for a new feature may be posted in multiple communities' meta categories, as well as on Meta Codidact. That is definitely a cross-community duplicate.

It is the curators in each community that best knows if a question they receive, is a cross-community duplicate. Their knowledge of the community they curate, is best fit to judge if the question is this type of duplicate.

We do not yet have the functionality on Codidact to close posts as duplicates across communities. That is something to be implemented down the road.


### Signposts

Exact duplicates are often not very useful to keep around. Low-quality duplicates will suffer the same fate. We eventually delete them.

On the other hand, some questions provide a different entry to the same answer. Others simply present a different view of the same problem. Together, they all form useful paths toward the same set of answers. Therefore, we consider these questions signposts. We still close them as duplicates, but we do not delete them, because they are valuable to keep around. 


### Is it necessary to _close_ duplicate questions?

Yes. In order to prevent fragmentation of knowledge, and to make it easily accessible and discoverable, it is beneficial to ensure that duplicate questions link back to the location in which the answer is already found, as well as prevent answers from being posted to the new duplicate question. It would be very hard and confusing for both curators and answer seekers if the knowledge is scattered all around Codidact. Additionally, it will promote repeatedly posting the same question from different users, which bloats our knowledge repository with no added value.


### Question incorrectly closed

We all make mistakes. That includes the curators and moderators on Codidact. Luckily, a question closure is not the end of the world. If you are confident that a question was marked as a duplicate in error, flag to reopen it. It may also be useful to edit the question to clarify it, or post a comment explaining the case.

### The duplicate question and answers are outdated

Use the "outdated" reaction on the posts. There is currently no system in place to handle these, but we'll build one down the line.