Tough and stupid interview. People are unprofessional and have a bad experience. No respect for interviews and has the worst food facilities. The most fundamental aspect of assuring value is making sure that the supplier hits your price requirements. These can be gleaned through simple interactions as well as formal negotiations. This metric is most applicable when you are looking at inter-period changes. Expressed in a measurement tool would be something on the line of ‘percentage price change year-on-year’. So, if the quoted price is $100 in year one and $106 in the second year, the recording change would be +6%.