the Pāli Canon, and the folk religious elements embraced by many monks – have motivated some scholars to consider Theravāda Buddhism to be composed of multiple separate traditions, overlapping though still distinct. Most prominently, the anthropologist Melford Spiro in his work Buddhism and Society separated Burmese Theravāda into three groups: Apotropaic Buddhism (concerned with providing protection from evil spirits), Kammatic Buddhism (concerned with making merit for a future birth), and Nibbanic Buddhism (concerned with attaining the liberation of Nibbana, as described in the Tipitaka). He stresses that all three are firmly rooted in the Pāli Canon. These categories are not accepted by all scholars, and are usually considered non-exclusive by those who employ them. The role of lay people has traditionally been primarily occupied with activities that are commonly termed merit-making (falling under Spiro's category of kammatic Buddhism). Merit-making activities include offering food and other basic necessities to monks, making donations to temples and monasteries, burning incense or lighting candles before images of the Buddha, chanting protective or scriptural verses from the Pali Canon, building roads and bridges, charity to the needy and providing drinking water to strangers along roadside. Some lay practitioners have always chosen to take a more active role in religious affairs, while still maintaining their lay status. Dedicated lay men and women sometimes act as trustees or custodians for their temples, taking part in the financial planning and management of the temple. Others may volunteer significant time in tending to the mundane needs of local monks (by cooking, cleaning, maintaining temple facilities, etc.). Study of the Pāli scriptures and the practice of meditation are less common among the lay community in the past, though in the 20th century these areas have become more popular to the lay community, especially in Thailand. A number of senior monastics in the Thai Forest Tradition, including Buddhadasa, Ajahn Maha Bua, Ajahn Plien Panyapatipo, Ajahn Pasanno, and Ajahn Jayasaro, have begun teaching meditation retreats outside of the monastery for lay disciples. Ajahn Sumedho, a disciple of Ajahn Chah, founded the Amaravati Buddhist Monastery in Hertfordshire, which has a retreat center specifically for lay retreats. Sumedho extended this to Harnham in Northumberland as Aruna Ratanagiri under the present guidance of Ajahn Munindo, another disciple of Ajahn Chah. Lay devotee In Pāli the word for a male lay devotee is Upasaka and a female devotee is Upasika. One of the duties of the