HSBC has a formal internal and external communication system. Internally, communication flows upward, downward, horizontally, and diagonally between employees using various formal methods like letters, reports, and memos as well as informal grapevine. Externally, HSBC communicates formally with customers, shareholders, and regulators and informally with society using various tools like their website, SMS banking, television advertisements, and ATM services. Meetings are held weekly to discuss problems and plans. Employees receive training to develop their communication skills.