The invitation to employees to participate in the survey can be done via either email or memorandum.
In both cases, certain key information must be communicated.
If the invitation is an email for an Internet survey, the email should contain the URL. Care must be taken to ensure that the URL is a hot link (employees should simply be able to click on the link to go to the survey) and that the link actually leads people to the correct URL. The message should appear within the text of the email itself, rather than in an attachment.
If the invitation is a memorandum inviting people to participate in a paper-and-pencil survey, the questionnaire and a return envelope should accompany it. The memorandum should tell people how to return their completed questionnaires.
Optional information to consider including in the invitation:
To maximize response rate, the invitation should come from within the organization itself, and should be signed by a senior manager (the CEO if possible). For a paper-and-pencil survey, the questionnaire packet should be delivered to people at their places of work instead of mailing it to their homes.
We keep on file samples of successful invitations (with the company names removed, of course), and make these available to clients.