The Prayer Book (Alternative and Other) Services Measure 1965 provided that for a limited period the services of the C of E might follow forms sanctioned by the Church Assembly (later by the General Synod) as well as the BCP. The Church of England (Worship and Doctrine) Measure 1974 allowed the use of such services on a permanent basis. After 3 series of separate services had been used experimentally, the complete Alternative Service Book 1980 was authorized. In modern English, it included 2 forms of Eucharistic rite, (optional) short forms of Morning and Evening Prayer, and a Calendar with many new names. It has been superseded by Common Worship (q.v.).