This is commonly used in disability care. It sets the standard to strongly include the person/people affected in decisions that affect them. It is very helpful to address unequal power dynamics especially where those charged with providing care have unequal power with the recipient; think teacher, surgery, disability care etc.

In practical terms, it encourages officers and practitioners to stop assuming and do the work to bridge the gap and attempt to find out as best they can what the person affected would like to happen. It leads to much superior decision making as surprise, suprise, finding out what a user really wants over just assuming (and often missing important details), amazingly, leads to much more informed and improved decision making that also work better for the people involved and affected.