Scholarship in information systems for emergency management (EMIS) suffers significant theoretical fragmentation. Out of 56 papers included in our literature review, we counted 34 different theoretical approaches. Fragmentation is problematic because it hinders knowledge accumulation and the ability to cross-relate research results. Prior research proposed to mitigate the downsides of theoretical fragmentation in EMIS by reorienting and unify EMIS research under an Effective Use Theory (EUT) perspective. However, the validity of EUT in chaotic environments -- e.g., natural disasters -- has yet to be assessed. Our research problematizes and contextualizes EUT in chaotic environments to offer a research platform for developing a EUT perspective on EMIS.