What does a block watch do?

I went online and searched Block Watch. I thought this was a good website that thoroughly explained how a Block Watch works in a community. I picked Block Watch for my topic because I am a Criminal Justice major and was eager to see how the Block Watch reduced crime in the Johnsons Park neighborhood. Here is some information I found on the website :

http://www.blockwatch.com/involved.aspx


HOW DOES BLOCK WATCH WORK?
Block Watch is a program of a neighbor helping neighbors. The Block Watch Program is a free community-based crime prevention program administered by your local police. Residents on a street or in a complex form a communication chain, aided by a block map of names, telephone numbers, and addresses. They make a commitment to watch out for each other's homes, and report suspicious activities to the police and to each other. They also keep each other informed about neighbourhood occurrences, burglary, thefts, and other crimes or problems occurring on their street.

RESPONSIBILITIES OF THE BLOCK WATCH PARTICIPANT
-Watch out for their neighbor and their neighbor's property.
-Notify police of any suspicious activity or crime in progress.
-Report if they have been a victim of crime.
-Notify their Block Captain if they have been a victim of a break and enter or other criminal/suspicious activity.
-Update security and hardware in their homes.
-Mark all valuables with their driver's license.
-After participants have marked & catalogued their property they will be given Block Watch --decals by the Captain.
-Attend yearly Block Watch meetings in their neighborhood.