Cadbury World uses various external and internal communication methods with customers and staff. For external communication, they use their logo, slogans, letters, telephone calls, emails, face-to-face interaction, and a tannoy system. Letters allow for a personal touch but can get lost or damaged, while email is fast but impersonal. Internally, they communicate via email, tannoy, radio, meetings, and notice boards to coordinate staff and address any issues. The tannoy and radio systems are quick but have limitations around personal messages or power outages. Face-to-face interaction is most personal but an employee's mood could impact customers.