This public health programme guidance will consist of recommendations on broad-ranging (those that may apply across a range of topics or behaviours) and specific interventions (those that relate to a particular activity like smoking) that aim to promote or support attitude, knowledge and behaviour change, in order to help reduce the risk of developing preventable diseases or conditions or help to promote healthier lifestyles. This guidance will provide recommendations for good practice, based on the best available evidence of effectiveness, including cost effectiveness.