Adjudication: where a dispute between two parties is settled by an adjudicator within 28 days using their own knowledge and the evidence put forward by the parties. If one party does not accept the adjudicator's decision, the dispute can be settled by going through arbitration or going to court. Adjudication is popular for smaller, less complicated scenarios.
Arbitration: where two disputing parties submit evidence to an independent third party - the arbitrator - and agree to be bound by the arbitrator's decision.
Arbitration can take any length of time and is usually used for complex disputes which could not be settled within a restricted time frame.