Link to Study Guide 1
The Second Vatican Council (Constitution on the Sacred Liturgy, 11) decreed:
Pastors of souls must therefore realize that, when the liturgy is celebrated, something more is required than the mere observation of the laws governing valid and licit celebration; it is their duty also to ensure that the faithful take part fully aware of what they are doing, actively engaged in the rite, and enriched by its effects.This series is an attempt to respond to what Vatican 2 is asking. We can follow the rest of the series by signing up for it (free) here. Three minutes or so a week, plus a bit more to read the study guide, seems a fairly painless way to enrich our participation in the Mass.