The following summarizes our view on good or bad edits as was seen from related meta posts (see below), comments, and chat discussions we had over time:

- **it edits typing errors, corrects punctuation, adds formatting:**  
This may look *too minor* at first sight but we are a language site. We should not tolerate minor mistakes but we should edit them, the quicker the better. Comments are o.k. but if on questions they may hang around too long. If an error was not corrected it may provoke answers leading away from the question, and the answers will need an edit too after such an error was edited. Adding formatting to a post is wwelcome of it led to a consistent site's appearance and improved legibility but we should not overdo it.
- **it improves the overall grammar:**  
That's what we expect of a good edit. If the grammar was not subject of a question, or if it was in an answer we should not hesitate and improve the post. Advanced speakers of German will be grateful to see that somebody cares, and beginners will learn a lot from this.
- **it adds additional information from comments:**  
We should highly encourage this, as an overlong comment thread is cumbersome to read, and valuable information may easily be overlooked. It is much better we had included this in a question or answer to then flag the comment as *obsolete* for clean-up. If the OP had no time to edit I see nothing wrong if we did that for them.
- **it adds a missing link, a quote or other reference:**  
This may be very valuable as it supports the content with an other resource. However we should take care that any such link is of value indeed. If it was overt spam it should be removed immediately, if it was any doubtful *[AskJaqueline.com][1]* site we may not want to support them with a link. If it was a link prone to be dead soon it may not help in the long run. Such links should not stay. Any verbatim quotes should state their source.
- **it adds an additional point not made so far:**  
Sometimes an otherwise good answer (rather than a question) is missing some details or aspects. Then we have the choice to write another answer (which then will likely be incomplete), comment on the post (which may be overlooked easily), or edit those points into the answer, just as we would do on a Community Wiki post. By editing we may turn a good answer into a great answer, which I believe we should encourage. Take the reputation point the original poster may get in addition as a reward for making this possible at all. At the end the resulting good content on our site is what counts. If these additions did not add any value they should be removed.
- **it adds a whole paragraph of additional information:**  
If this improved the post *in any way* it is welcome, but if there is only a very minor benefit we may leave it to the OP to roll back or not. In case absolutely no value was added we may safely roll back an edit.
- **it edits the post in a way that the original content was lost or conclusions were reverted:**  
This is usually an edit we do not accept. However in rare cases we may have tried to salvage a poor question or answer which otherwise would have to be deleted. These cases should be an exception. We may add a comment explaining the reason behind such an edit.
- **it removes content:**  
Valuable content should not be deleted. We should keep an eye on those "destructive" edits to make sure this did not happen. Note that removing salutations, *Glad-I-found-yous*, and *Thank-Yous* helps to keep posts clear and to the point. That is why editing such sections out is encouraged on all Stack Exchange sites. We should not be different.

- **it adds plain wrong information:**  
In these clear-cut cases an edit is not welcome and should be rolled back.  

If we are unsure we should discuss matters in the [German Language Chat][2].

Read also these related posts:

https://german.meta.stackexchange.com/questions/655/how-to-handle-typos-that-are-significant-in-respect-to-why-the-question-came-up  
https://german.meta.stackexchange.com/questions/533/where-do-i-find-help-on-formatting-my-post  
https://german.meta.stackexchange.com/questions/440/let-us-clean-up-comments  
https://german.meta.stackexchange.com/questions/331/spelling-mistakes-in-questions  
https://german.meta.stackexchange.com/questions/676/some-guy-corrected-99-out-of-100-errors-in-a-post-should-i-correct-the-remainin  
https://german.meta.stackexchange.com/questions/319/how-to-avoid-too-many-edits-from-different-users  
https://german.meta.stackexchange.com/questions/235/should-we-change-to-in-german-questions  
https://german.meta.stackexchange.com/questions/4/editing-orthographic-errors  
https://german.meta.stackexchange.com/questions/289/is-my-edit-appropriate  

On general SE Meta:

https://meta.stackexchange.com/questions/155538/what-are-the-guidelines-for-reviewing

  [1]: https://german.meta.stackexchange.com/questions/788/how-to-handle-suggested-edits-that-are-correct-but-extend-the-answer-or-questi
  [2]: http://chat.stackexchange.com/rooms/499/german-language