... Parenting interventions Anti‐social behaviour Randomised controlled trial Disadvantaged groups Social problems United Kingdom Social services Early interventions for behavioural difficulties can be a cost‐effective way to prevent adverse outcomes (Scott et al., 2010). Randomised...

... acceptable levels of fidelity. School‐based prevention programmes attempt to apply theory in a manner that effectively reduces social problems in an identifiable way. Once interventions demonstrate high internal validity, they must maintain the quality that led to their impact, especially...