What is this 'active participation'?

Author
Ryan, Mary Perkins.
Publisher
Liturgical Press,
Place of Publication
Collegeville :
Date of Publication
1 959
Subjects
Mass - Participation
Location No.
dc1, dc2, dc3 (2 )
Number of Pages
36 p.
Notes
Three copies
Parish Record
No
PCF File
LITPRES
PCF Record Number
30