Service of decisions and orders: delivery, authorised agent receipt, or affixation governs when documents are treated as served. Service of decisions, orders, summons and notices proceeds in three stages: primary service by tender or delivery to the person or authorised agent, including registered post, speed post or approved courier; secondary service by affixing a copy to the person's factory, warehouse, business place or usual residence if primary service fails; and tertiary service by affixing a copy on the notice board of the issuing officer if the earlier methods cannot be effected. Documents served by these modes are deemed to have been served on the date of tender, delivery by post or courier, or affixation.