One person has a very messy apartment while another person has a very neat apartment. What procedure(s) is (are) necessary to use a need for order to explain the difference in the messiness of their apartments? The procedure involves

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Both devising a rating scale for measuring the need for order and showing that scores from a need-for-order scale correlate with messiness/neatness of an apartment are necessary procedures to use a need for order to explain the difference in the messiness of their apartments. Without a way to measure the need for order and a correlation between the need for order and the state of the apartment, the explanation would lack validity.

One Person Has a Very Messy Apartment While Another Person