PageDeletion

Delete a page if one or more of the following are true:

• It's not connected to any other pages, nor likely to be connected (Click on the page title to find out)
• Deleting it resolves an argument amicably and consensually
• You wrote it and you think better of having written it
• You're refactoring in a way that makes it redundant

or

• It's just flamage or an editing experiment by a newbie.

Don't delete a page if:

• You don't know what it means
• It's not on a topic that interests you
• Its content offends you
• Someone you don't like wrote it

or

• It's short.

That last one appears counter-intuitive. For example, if a page is just the plural form of another page, and only contains a link to the other page, then it seems a bit much to have two pages. I'm imagining that you're saying that there's no sense in deleting a page that is a small start to an (important) new topic. --JohnStoshMuczynski

Source: Wiki:DeletionGuidelines