In adopting a quasi-foundational approach, there are ways to ensure rigour and the trustworthiness of interpretations. The social phenomenology of Schutz, used to derive themes and as a basis for theory development from respondent perceptions, requires meeting three postulates, namely logical consistency, subjective interpretation and adequacy. For the first, we have highlighted how the research problem and methods were derived from a real world problem on which was based the questionnaire, sampling strategy and the need to interview; for the second, by using respondents' views to develop interpretation (different than most studies as the first order or naturalistic constructs are expert ones); and for the third, by linking second order constructs to activities and phenomena in blood risk management. Furthermore, trustworthiness can be demonstrated by credibility and confirmability (see [51, 52] for practice-based examples). We have provided a trail from problem identification, questionnaire development, coding taxonomies to themes and theoretical development. We have also provided the rationale of respondent selection and sampling design as well as an outline of procedures followed to arrive at constructs or themes. We have derived through these themes risk discourses and logics relevant to blood risk management. Before finalization, the study results and recommendations were presented at a consensus conference of study participants and stakeholders, to ensure validity of data interpretation. All suggestions made were incorporated into the final results. Although we recognize that all researchers will not necessarily agree to the ways we have sought validity for these findings (see [53] ), first author conversations with risk managers point to the utility of the interpretations. Thus this qualitative investigation has contributed a nuanced risk characterization.