A contractual brief involves a written contract between a company and worker that specifies the work to be done, timeline, and expectations. It provides clear guidelines and evidence if issues arise. However, it could result in legal action if the brief is not followed. A formal brief outlines the work but lacks legal binding on payment, timeline, etc. so disputes could occur. An informal brief involves only a verbal agreement with no evidence of terms, allowing loopholes. Co-operative, negotiated, and commission briefs involve multiple companies collaborating on a brief, providing experience but requiring effective teamwork. A tender brief has companies submit proposals for a job, while a competition brief judges submitted work with a winner receiving payment.