In the context of eParticipation it may sound like an old-fashioned method. However, receiving an invitation with your name on it in your letter box will often make the receiver feel a bit more special and take the invitation more seriously. You can of course also send an email, but the invitation can easily get overlooked in an already crammed inbox. Being able to apply this method will of course require that you have access to a record of addresses. Again, having access to and obtaining this kind of record is highly country specific: in some countries, you can obtain the addresses through the Office of Civil Registration. Another option is to buy the addresses from a market research company.