Final answer:
The term commonly followed by scientists when designing and completing experiments is Method. Scientists follow a process called the scientific method that involves making observations, formulating hypotheses, designing experiments, and analyzing the results to draw conclusions.
Step-by-step explanation:
The term commonly followed by scientists when designing and completing experiments is Method. Scientists follow a process called the scientific method that involves making observations, formulating hypotheses, designing experiments, and analyzing the results to draw conclusions. The method can be modified to suit different situations and is applicable in various fields.