Case Closer was originally devised as a way for the billing department of a large medical practice to track down loose ends. To get insurance claims paid, billing staff had to ask clinic managers to track down doctors to get them to correct encounter notes so they could be billed. They had been emailing over 100 spreadsheets back and forth every week. This was a very frustrating way to track things.
Case Closer eliminates emailing spreadsheets back and forth. It's hosted in the cloud, so without any IT setup on your end - everyone can update the same data. You can define your workflow however you need to and custom views let everyone focus on their own person to-do list. Updates are stamped with who updated it (and when), so you can tell where the bottlenecks in your system are.