Bill of Exchange (Section 5): Written unconditional order to pay fixed sum. Parties: Drawer (issuer), drawee (payer), payee. Elements: (1) Written; (2) Unconditional order; (3) Fixed amount; (4) Drawee identification; (5) Signatures. Acceptance: Drawee accepts by writing acceptance on bill. For accountants, bills common in international trade; understanding acceptance procedures critical.