When we learn something anonymously, we push very hard to bolster our reporting with on-the-record information and documents. But often the first alert of something going wrong comes from a nervous insider who wants to expose something amiss but can't afford to risk his or her job.

We recognize the need to upgrade our 911 centers. It's critical that our first responders have that information at hand as they're responding to the scene of an event.

Twitter and Facebook are brilliant tools, the journalistic uses of which are still being plumbed. They are great for disseminating interesting material. They are useful for gathering information, including from places that are inaccessible.

People crave trustworthy information about the world we live in. Some people want it because it is essential to the way they make a living. Some want it because they regard being well-informed as a condition of good citizenship. Some want it because they want something to exchange over dinner tables and water coolers.

We would encourage anyone with information to come forward,

There are many defects that were alleged; we're down to three. We'll provide the information, we'll tweak the project, and move on.