If you or your employees find it hard to stay at a desk to finish a project, it might not be an attention problem, but something that makes it uncomfortable to sit in the computer workstation furniture. Maybe it is the chair; they get a stiff back and have to move around a lot. It could be the way the computer screen sits on the desk causing them to look up or down and get a stiff neck. Having the proper furniture can mean a lot more work gets done.
If your company has a surveillance center allowing you to watch how everyone is sitting at their console furniture, take a bit of time and see how people are moving. If you notice a lot of stretching or rubbing of the neck, it may be time to consider getting new furniture. Your people will be much happier, feel much better and get a lot more work accomplished if they can sit at their desk comfortably for long periods of time. You may just need new chairs for everyone or maybe new desks. The important thing is to get something everyone can work with.
If you are unable to see how everyone is working, it may be time to think about having audio visual integration in the offices. It is not spying on your workers, but merely providing them and yourself a quicker means of communication with one another. Now, instead of having to get up and go to the office to have a face-to-face talk, you can push a button, see them and talk with them.