One of the core principles of Scrum is Empirical Process Control.

Empirical Process Control model helps make decisions based on inputs and requirements that are clearly

defined and sorted out.

Empirical Process Control model helps make decisions based on a particular input that will always provide

a specific output.

Empirical Process Control model helps make decisions based on processes that generate unpredictable

and unrepeatable outputs.

Empirical Process Control model helps make decisions based on observation and experimentation rather

than on detailed upfront planning.