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. Commission briefs involve fixed fees for executing commercial work. Tender briefs invite bids for large government/financial projects. Cooperative briefs help manufacturers understand target markets through shared advertising resources. Competition briefs involve rivalry as companies aim to be leaders in their market.