This paper outlines methods and reasoning that advocate for the use of expert Coach and Athlete knowledge in support of mutivaraite analyses in Sport Biomechanincs and related disciplines. It argues that human movement research involving the collection of multiple dependent variables suffers similar problems to other areas of behavioural science, in that models proposed for analyses are inadequately constrained by other data and are vulnerable to a-posteori modification that lacks sound theoretical or evidential justification. An approach is presented where expert accounts of how successful movements are performed are captured and analysed qualitatively, in order to present data themes that may be used to identify important events and variables for analyses when quantitatively examining movement. This paper argues for the utility of a specific mixed-methods approach to movement research involving multiple dependent variables.