Traditional methods for understanding change of possession (turnovers) in team-based invasion sports have not accounted for how the dynamic, interactive actions of multiple players contribute to turnovers. One approach is to access the expertise of highly skilled coaches to determine the important tactical behaviours that create turnovers. In this study, we synthesised expert opinion from 12 experienced netball coaches with a consensus-based method (the Delphi method). The expert group undertook one-on-one interviews which were coded using thematic analysis to identify and code any tactical constructs. From this analysis, a preliminary list of tactical behaviour definitions were created and used for the subsequent rounds of data collection and analysis. Two rounds of questionnaire followed the initial interviews to validate the list of tactical behaviour definitions. As a result, the tactical principles guideline (TPG) was developed which included (nine attacking tactical behaviours and nine defensive tactical behaviours). The tactical behaviours can be grouped thematically into four overarching tactical principles, including; space and movement, timing, support and reading play. Each of the four tactical principles is derived from interactions between multiple players highlighting that, in high level netball, turnovers typically result from the team dynamics rather than from individual player behaviours (i.e., a poorly executed pass). Therefore, when using game statistics to assess performance it is important to acknowledge that errors and successes are the result of the interactions of multiple players on court, and not solely a reflection of individual players' tactical ability. The TPG has been incorporated into a Netball NZ player profiling tool as it is seen to be the first step in enhancing the effectiveness of coach and player communication, tactical behaviour assessment, as well as informing selection processes.