Altar servers seem to be a vanishing breed. When I was a kid, (when it snowed every day while I walked to school barefoot), there were always at least two altar servers at every Mass. Important feasts could draw up to six.
I have even seen Masses in one church where there were close to a dozen servers and they all had something to do and did it well.
Sadly, this does not appear to be the case anymore. If there are two servers at Mass I am surprised. If they are actually doing anything, I am amazed.
Called to Serve attempts to provide servers with the basics of what they should know and how they should act at Mass. For this the book is a great service. However, once I read the book I realized that it is very short on what a server actually does.
The book is basically a workbook for altar server training. There are instructions, illustrations and places to take notes which are all quite helpful. Some of the questions asked are ones I never thought of except in a panic trying to find a book I had forgotten while father waited up at the altar.
The book also contains instructions on how to use incense, walk in processions, participate in Mass, and how to properly bow, genuflect, and just in general behave while in the sanctuary.
What the book lacks is a run-through of the Mass that explains exactly what the server is supposed to be doing at each part. There are sections of the book for writing this information in, I guess to allow for varied parish situations. However, there are plenty of things that are supposed to be done at all Masses by the servers that could very easily have been included.
I recommend that this book as a handy workbook for a server that fills in some details not found in the Missal but when training servers, a copy of the General Instruction will be essential.