Learning Level: ADVANCED

Pre-Snap Reads.
    Uncovered receivers
    Location of safeties (MOFO/MOFC, anticipate coverage)
        1. One safety deep (cover 1 free/3)
        2. Two safeties deep (cover 2/4/quarters); the Cover 2 "shell" to disguise other coverages
        3. Zero safeties deep (cover 1 man/blitz)
    Reaction to motion (backfield/TE/flanker)
    Identifying the front and potential blitzes
    Visualizing the run or pass routes (including "hot")
    Change play if necessary
Post-Snap Adjustments.
    Read on the drop (MOFO/MOFC, confirm or change pre-snap look); the Cover 2 "shell"
    Adjust as necessary
    Progression and timing

See also Reading Safeties to Determine Structure and Blitz Pressure by Karl Dorrell (Offensive Coordinator) of the University of Washington.