How can I create a system that measures productivity

Question

Hello!

How can I create a system that measures productivity in the creation of a product.

Example

A user needs to comply with a workOrder created by an administrator, that work order has products that have to be produced the same day, and at the time of beginning it must capture the current date and time, and at the end of the date and time of termination,

Users must have hierarchy at login, depending on the department to which they belong is their menu, for example the administrator can register users, etc etc, and a normal user, should be able to start with the production of the work order of the day, no if anyone has any document, or any link that can serve as a reference.

this my database diagram rigth now, I need help.. I know