What is worship? Keith F. Pecklers, S.J., answers this important theological question by focusing on the basics of Christian worship. Beginning with the definitions of such terms as “ritual” and “liturgy” he writes in a very readable style about the historical/theological foundations of worship, tracing the evolutio of Christian liturgy from the earliest centuries of the Christian era up to the reforms of Vatican II. Pecklers focuses on such liturgical issues of importance in our post-Vatican II Church as: inculturation, popular religion, and the social responsibility that authentic worship requires. He also considers some key social issues of the twenty-first century and their impact on our worship: the break-up of the stable parish community and decline in church attendance; the clergy shortage and priestless parishes; ecumenical liturgical cooperation and interreligious dialogue; the credibility of preaching; and how worship welcomes or excludes the marginated.Chapters are “Worship and Ritual,” “Worship in Development and Decline,” “Worship in Crisis and Challenge,” “Worship in Transition,” “Worship and Culture,” “Worship and Popular Religion,” “Worship and Society,” and “Worship and the Future of Christianity.”Keith F. Pecklers, SJ, SLD, is professor of liturgy at the Pontifical Gregorian University in Rome and professor of liturgical history at the Pontifical Liturgical Institute of Saint'Anselmo. Liturgical Press recently published his book Dynamic Equivalence. He received Catholic Press Association awards for two other Liturgical Press publications, The Unread Vision and Liturgy for the New Millennium."