def METHOD_NAME(self, inputs, outputs):
    for input_key in inputs:
        val = inputs[input_key][0]
        geom_name, group_name, parm_name = input_key.split(":")
        container_id = self.vsp_model.FindContainer(geom_name, 0)
        self.vsp_model.SetParmValUpdate(container_id, parm_name, group_name, val)
    self.vsp_model.Update()
    parm_id = self.vsp_model.FindParm(container_id, "TotalArea", geom_name)
    outputs["S_ref"] = self.vsp_model.GetParmVal(parm_id)