The college football season is entering its final weekend and there is plenty on the line in terms of BCS berths and momentum.

Most of what determines those things happens on the field, but there is plenty of other stuff happening in the press box and on the sidelines. Here is a look at what goes into adjustments, strategy and positioning, and the numbers that all teams must pay attention to.

By the numbers
The stats that most often determine wins and losses are scoring offense and defense, turnover margin and field position, and where a team starts has a lot to do with the other factors.

A team has a 15 percent chance of scoring when it starts inside its own 20 yard line, 25 percent from its own 20 to 40 and 40 percent between the 40 yard lines. Those chances jump all the way to 60 percent when starting from the opponents 40 to 10 and 75 percent from the 20 and in.

Third-and-short situations are also determining factors, and if a team can convert 80 percent of those plays and stop the opponent on 80 percent it will almost surely win.

Excellent pass efficiency defense is also key in trying to maintain the upper hand in the field position battle

But nothing destroys field position and down-and-distance numbers worse than penalties. Flags for holding, false stars, delay of game, offsides and illegal blocks in the back are the biggest culprits.

It all starts up front
As far as the players themselves, one phase of the game to watch closely is the play of the offensive line. Linemen will operate from three levels of depth to perform at the maximum level.

Level 1 enhances short-yardage or goal line play by aligning the player's down hand with the back end of the football, while Level 2 is used for most runs and play-action passes has the down hand splitting the distance between the back end of the ball and the center's toes.

Level 3 is utilized on most drop-back passes, screens and draws with the hand aligned with the center's toes or the helmet on the center's jersey number.

The splits of the offensive linemen, or the distance between them as they line up, is also something to keep an eye on. Goal line and short-yardage will have everyone on the line a foot or less apart, and minimum splits on other downs would be one foot from guard to center, and two feet for tackles and tight ends. Maximum splits will be two feet for guards and three feet for tackles and tight ends.

Coaching dynamics
Many fans also wonder about game organization and what offensive coaches are doing on any given play. In the following scenario Bob is the offensive coordinator, Bill the offensive line coach, John the tight ends coach, Greg the running backs coach and Lou the receivers coach.

Bob calls the play from the press box and it is signaled in from the sideline by Greg. That's when the fun begins.

Bob watches the point of attack, Bill checks the defensive front and and the playside offensive line and Greg watches the backfield action at the point of attack.

While that is happening, Lou will focus on the defensive secondary and John checks the backside front. All the while, John is charting defensive fronts, coverages, etc., in relation to situations and Greg is charting the offensive calls.

But that's not all. Each of the coaches named above will also help out in the kicking game by watching specific players or areas of the field.

The other halftime show
As a team goes into halftime it is necessary to make adjustments. The head coach and coordinator discuss the plan for the next series and then talk it over with their position players. Here is a sample of what might take place as the offense prepares for the second half.

HALFTIME
1. Players must be allowed to rest.
2. All injury/equipment problems must be taken care of.
3. Staff must analyze the 1st half and make 2nd-half plans.
4. 2nd-half plans/adjustments must be transmitted to players. 


Breakdown
1. First period (Six minutes)
    a. Staff meets
    b. Team rests
2. Second period (five minutes)
    a. position coaches meet with players
3. Third period (four minutes)
    a. Coordinator meets with entire offense
4. Fourth period (one to three minutes)
    a. Head coach meets with entire team


Period One
1. Fronts by down and distance
2. Secondary by down and distance
3. Short-yardage and goal line defenses
4. Review calls: tendencies, successful/unsuccessful plays
5. Kicking game
    a. Assignments and breakdowns
    b. Can we fake?
    c. Change block or return philosophy
6. General
    a. Personnel adjustments because of injuries
    b. Playing conditions
    c. Substitution changes
    d. Analysis of overall game


Period Two
1. Quiz players on what is happening
2. Transmit our 2nd-half strategy


Period Three
1. Must convey problems into solutions
2. What we must do in order to win


Period Four
1. Finalize all strategy and goals, motivate for 2nd half

As you watch games with extremely high stakes this weekend, keep an eye on the little things and remember everything that is going on outside the white lines.

ESPN.com college football analyst Jim Donnan takes part in chats and makes observations on Saturdays as part of College GameDay Online.