Introducing Christian Doctrine (second edition, 2001), written by Millard J. Erickson and edited by L. Arnold Hustad, is a briefer version of Erickson's previous work, Christian Theology. Introducing Christian Doctrine is an introductory-level textbook in systematic theology.
This book covers the full gamut of Christian theology, with sections on what theology is, God's revelation, the nature and work of god, humanity and sin, the person and work of Christ, the Holy Spirit, salvation, the church, and eschatology. On issues of doctrine, Erickson explains the various positions, identifies their strengths and weaknesses, and then pronounces which he believes is the best position. The reader may not always agree, but Erickson's arguments are well-reasoned and logical.
Introducing Christian Doctrine is easy to read, perhaps surprisingly so, both for theology students and laity. And in addition to being a worthwhile textbook, it also serves as a very handy quick reference guide to doctrinal questions. No self-respecting theologian should be without it.