You are working for an automotive parts manufacturer, and are responsible for product testing new brake pad designs against the standard model. Specifically, you are tasked with testing if the new brake pad designs will improve vehicle stopping distances. You have $100$ different vehicles to test on$,$ ranging from small compact cars to large trucks. Similarly you have a well controlled indoor test track on which to conduct your experiments, that can simulate different road types $($gravel$,$ asphalt, and concrete$).$ The break pads have been removed, and each vehicle can only have one set of break pads installed $($new or old model$),$ as swapping them is very time consuming.

Last minute you are called to a very important company meeting, and instructed to let your staff handle the experimental data collection. Unfortunately, though your staff are diligent and well intentioned, they do not have a good understanding of experimental design, and left to their own devices will do whatever it is they find easiest to complete the objectives set before them.

Give a set of instructions for your staff to follow to conduct a thorough experiment for assessing whether new brake pad designs improve stopping distances. Be sure to address at least each of the following points:

Identify the variables that staff should record for each individual test.

Identify other variables the staff should account for on each test

Specify how they should set the experimental conditions for each test.

Identify key fundamentals of experimental design that you include in your experimental design.