Some of the methods companies are using to carry out health and safety audits don't allow for anonymity and have low response rates. Some are time-consuming or difficult to manage. There can be a focus on who said what, rather than the challenges that need to be addressed.
EcoOnline's Survey module allows users to create and send online surveys. Users can respond with their names attached or anonymously, which encourages honest answers about conditions in their company.
You can easily get an overview of all responses and create an action plan from there. Take action on employee feedback, and increase the chances they will continue to give their honest input.