The HHS criteria do not consider the magnitude of impacts in determining whether a model has evidence of effectiveness.
Even though magnitude is not considered in the HHS criteria, HomVEE reports standard effect sizes for findings rated high and moderate when they were available in the manuscripts or the HomVEE team had enough information to calculate them. Effect sizes can be found in the Effects shown in research section of each model effectiveness research report. The reports can be accessed through the Model Effectiveness Menu.
Is there any consideration given to those models that may not demonstrate a large impact because the sample members are difficult to treat (for example, parents with severe mental illness)?