One way to ensure that all employees participate is to invite them to the boss's chamber, allowing them to take the survey confidentially. This way, they will not carry work with them. You may invite them in small numbers and sit back to offer clarification on any points if requested by any. At the end, thank them with a chocolate and send them a thank-you mail without fail. If the manager or boss can be a part of the thanking process, even better. Once all of them have taken the survey, post striking results as a poster in strategic locations. This can be made interesting by using emoticons, catchy phrases, and visual aids such as charts and graphs as encouraging results are revealed. It will offer a chance for the employees to understand how they have been able to contribute.