When we conduct an electric shock investigation, we should be following the Scientific Method. This is where we make an observation, form a hypothesis, test the hypothesis, draw a conclusion and then communicate the result.
This method provides an objective and standardised approach, it helps to ensure the results are repeatable by anyone and seeks to minimise or eliminate bias.
It has its origins back as far as the ancient Greek philosopher Aristotle (384-322 BC) and Arab Muslim mathematician and scientist Hasan Ibn al-Haytham (c. 965 – c. 1040). Francis Bacon (1561-1626) was one of earliest scholars to refine the method and is often regarded at the father of it. Galileo (1564-1642) also contributed to the method, as did many others along the way.