Table 2.

Exclusion criteria for article screening

Central notion	Exclusion criteria (A-K)
Drones	A. “Drone” is mentioned, but the article is clearly out of scope (e.g., about insects, neuroscience, molecular biology, non-flying robotic systems, etc.) B. The focus is on purely technological aspects of drones and drone technology (e.g., sensors, flight control, flight planning, etc.)
Humanitarian use	C. “Humanitarian” is mentioned as a keyword, but the article itself does not discuss humanitarian responses D. The focus is on the military use of drones (including the “war on terror”) E. The focus is on the civilian use of drones, with no focus on the humanitarian context (e.g., farming, environmental damage, infrastructure surveillance, etc.) F. The focus is on regulatory issues of civilian drones, with no focus on the humanitarian context (e.g., airspace integration, standardization, etc.)
Ethical considerations	G. “Ethics” is mentioned as a keyword, but the article does not discuss ethical issues in a substantive manner H. The article discusses ethical matters on information or robotic technology in general, but not specifically in relation to drones
Technical criteria	I. No abstract is available for further assessment (relevant for the first round of screening) J. No full text is available for further assessment (relevant for the second round of screening) K. Other technical criteria (e.g., text is too short, full text is not in English, etc.)