Abstract: Computer implemented methods of collecting data relating to an adverse event relating to use of a substance is provided. One method comprises detecting a user input relating to an identity of the substance or to an identity of the adverse event; determining the identity of the substance or of the adverse event based on the user input; and selectively displaying to the user at least one further request for information, wherein the content of the request displayed to the user is dependent on the identity of the substance or of the adverse event. Another comprises detecting a user input relating to an identity of a substance; determining the identity of the substance based on the user input; selectively displaying to the user at least one potential medical indication of the identified substance based on the identity of the substance; and detecting a second user input to select the indication of the substance from the at least one displayed potential indication.