The productivity on an employee can be calculated by specific metrics that is defined by you, and by consistent measurement. This is a concept of Data Management which itself falls under the domain of business management. The tasks that exist in data management contain the formation of data policies, data architecture, data identification, storage, and data security.
There are a range of different techniques that are used to ensure data control and its smooth flow. This goes from the processing, the use, and the deletion of the data. It is quite a huge area of work, which is still being researched upon.