All games have rules. In soccer, rules are called "Laws."
AYSO plays by the FIFA Laws of the Game, with minor changes due to the fact that youths are playing, i.e., the fields, ball, and goal structures are smaller; fewer players on the field; substitution breaks added to allow for playing time requirement (3/4 of game in Davis). A summary of age-specific rules is here: age-specific rules, and, a list of Guidelines for Davis Referees can be found here: Davis Referee Guidelines
For Spring 2016, U16/19 games will be played with the following rules
Include gadget (iframe)