Answer:
Because it allows the understanding of a problem and a way to find possible solutions.
Step-by-step explanation:
Understanding the correlation between variables is an important source for understanding a problem and finding possible solutions. When we are mapping a process in a macro way we need to identify the process output. For example, if we are producing a service, the output is our delivered service, but this service can be evaluated on important viewpoints or variables that are important to our customer. The complexity of the service, for example, the greater the complexity the longer the delivery time or perhaps the more changes the longer the delivery time.