One of the biggest issues you may face with your customers is the lack of a good definition of what you think you are doing ...

Conceptual variables are often broad and complex, making them difficult to measure directly. For example, if the conceptual variable is "anxiety," an operational definition might be "the score on the ...

Correspondence to Dr Kenneth Lincoln Quarrie, High Performance Unit, New Zealand Rugby, 100 Molesworth Street, Wellington 6140, New Zealand; ken.quarrie{at}nzrugby.co.nz The Zürich Consensus Statement ...