Only a fair comparison provides trustworthy evidence
A fair comparisons of interventions provides the most trustworthy evidence about the effect of an intervention.
Unless a management intervention is compared to something else (for example, a similar intervention or simply doing nothing), it is not possible to know what would happen without the intervention, so it is difficult to attribute outcomes to the intervention.
A comparison, however, should be fair: the only important difference between the groups that are compared should be the intervention they receive.
Claims about the effect of an intervention that are not based on a fair comparison are less trustworthy
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