law of contract -- Consensus -- Contractual capacity -- Legality, possibility of performance and

-- Providing incentives -- Seeking sensitive information -- The possibility of causing harm to participants

create obligations -- Certainty, lawfulness and possibility of performance -- Formalities -- Voidable

-- Certainty of terms of contract -- Reality of consent -- Possibility of performance -- Common contractual

improper means -- 5. Formalities -- 6. Possibility of performance -- 7. Legality -- 8. Certainty -- 9