I agree with Diana Klein (Parish Practice, 30 August) that one person should serve one ministry at Mass. All too often I have seen the same person doing two ministries in the same Mass: for example, the altar server praying the Bidding Prayers out loud and being the altar server in the same Mass. I have seen choir members singing in the choir and then coming forward to do a Mass reading as well. I have seen the same person doing five ministries in a week.On all these occasions, there have been