Humans are of varying in nature. Because of this, the judgement made by one person won’t be similar to that of another person’s under equal conditions. Take the case of a judiciary system. What happens if laws are not applied consistently over people.. Ultimately it leads to the failure of the system. How can the consistency be ensured?

To understand this we need to monitor the system, analyse the variation and take appropriate actions. How can the variation happen? We need to understand the reasons for this variation. Variation can happen due to the subjectivity of judgement. Here the attribute which needs to be analysed for variation is ‘judgement’. Statistical tools like Minitab can be used to