*2.1. Study design*

The research questions driving this study were applied as part of a focused analysis on an existing dataset, collected in late 2016 using a qualitative research design to gain insight into specific participant perceptions and experiences. Data collection was facilitated by semi-structured interviews and application of the Scenario Invention Task Technique (SITT) [17,18]. The SITT is a pen-paper task that involves scenario-creation and combines principles of the Critical Decision Method [19] and Rich Picture Data method [20] to scaffold interviewing. Participants are asked to invent a challenging scenario specific to their work using illustrations to assist with verbalization and articulation in ways that encourage transitions from analytical and creative thinking, through to systems thinking [21] processes (i.e., holistic perceptions, consideration of changes over time) when answering their questions. The SITT has been used to elicit subject matter expertise and identify critical themes associated with safety, risk, training, and/or ways of working in a number of related complex domains [12,22–26].
