A method of determining a medical triage disposition for a person includes providing to a triage operator through a graphical user interface (GUI) of the computer: (i) a plurality of triage categories each including yes/no questions grouped into tiers that are ranked according to urgency and corresponding to a triage disposition; (ii) a selection of a relevant triage category based on a medical condition of the person; (iii) a quantification tool including follow-up questions related to symptoms, observations, and/or injury mechanisms, to enable the triage operator to quantify a level of severity of a symptom or injury related to yes/no questions of a subjective nature; wherein the triage operator determines a triage disposition for the person by providing triage to the person including: (i) asking, sequentially, the yes/no questions for the relevant triage category as displayed in the GUI; and (ii) asking follow-up questions from the quantification tool to determine whether a response to a yes/no question is properly considered “yes” or “no,” as stated in a response by the person.