[auxbuss]

Then, on the face of it, you have poor quality workers, or folk that are the wrong type to work remotely.

For cross-checking, CI (with code coverage), tdd, and pairing helps a lot, I find. And they're cheap to do.

[wariola]

There are many automated ways to do this too. Check out Parasoft Concerto. http://www.parasoft.com/alm

[gommm]

Code reviews are very important... You should always have another team member review the code produced by any of your employees..