Employment Act (Chapter 91): While not directly applicable to the thank you letter, provides the legal framework under which the internship was conducted in Singapore. This forms the background context for the professional relationship being acknowledged.

Personal Data Protection Act (PDPA): Governs the collection, use, and disclosure of personal data. When writing the thank you letter, ensure no unauthorized disclosure of personal or confidential information from the internship period.

Corporate Communications Policies: Internal company guidelines that may restrict or guide what can be mentioned about the company, projects, or work experience in external communications like thank you letters.

Singapore Business Etiquette: Cultural and professional norms in Singapore business context, emphasizing respect, professionalism, and appropriate formal communication style in business correspondence.