A proving is the frequent giving of a remedy, usually in low potency, to healthy volunteers for a period sufficient to produce symptoms.
Symptoms are usually recorded in a notebook in the patients' own words and then summarized by the proving team.
Provings are usually carried out in a double-blind manner where the prover and person administrating the remedy do not know what is being proved.
Many remedies are deadly poisons in crude form. For example:
Conium = hemlock
Lachesis = snake venom
Arsenicum = cyanide compounds
Poisoning symptoms when available are recorded and compiled.
When the repertory author considers a source reliable, they will include these symptoms based upon the experience of doctors who have used a drug successfully in curing disease.