Be critical

How certain are you?

Always ask yourself how likely a claim about the advantages of an intervention is likely to be true given the available evidence.

Whether or not you decide to use an intervention depends on how sure you are about its positive and negative effects.

How sure you can be depends on whether claims about the effects of the intervention are based on trustworthy evidence, which in turn depends on, for example, whether multiple sources were consulted, whether the evidence included a fair comparison, and whether valid and reliable measurement methods were used to assess the effect.

BEWARE

Only use an intervention when you are fairly certain that it will deliver a desired outcome.