Different types of design briefs include contractual, negotiated, formal, and informal briefs. Contractual briefs involve agreements between parties that are legally binding. Negotiated briefs allow discussions between parties to agree on terms. Formal briefs follow conventions for professional projects. Informal briefs have a relaxed style suitable for personal projects. Commissioning involves fixed fees for executing commercial work, such as the BBC commissioning programs. Tenders invite bids on large projects. Cooperative briefs help manufacturers understand target markets through shared advertising. Competition briefs involve rivalry as companies aim to attract sales and market share.