The iPhone GPS Check-In application enables a worker to check-in to their work location by simply launching the app on their iPhone and pressing ‘Check-In’. By exchanging GPS location information in real-time with the Natural Insight platform (www.naturalinsight.com), the application verifies that the worker is where they are supposed to be, at the time they are supposed to be there, as indicated to the worker by either a "green" or "yellow" button. Centralized reporting anytime/anywhere via the Web-based Natural Insight platform enables company management to take immediate action on any exceptions.