So let's use an example and put these PIs in use.
Lets say a beginner starts with a simple routine, 5 minutes warm-up followed by 5 minutes jelquing.
He sees when he is done, his unit is slightly larger, reddish and hangs fuller for a few minutes followed by some contraction.
Later on he finds that he has increased nite and morning wood.
Together this is a good picture, the increased nite and morning wood indicate that the other Neutral PIs can be interpreted as Positive PIs.
At that point, it would be sensible for this newbie to continue this routine and measure himself about once every one to two weeks.
If after two weeks, all the PIs are the same, yet he has made no gains, he should increase his force and or time of PE.
Why? Because there are no PIs indicating over training (Negative PIs), therefore his lack of growth is due to under training.
In this scenario, it would probably be smart to increase his jelque time to 10 minutes. This he should stay with, watching his PIs for indications of Negatives.
Growth for most of us is a slim margin between too much and too little.
So going back to our Newbie, so he ups his jelques to 10 minutes, and still has no Negative PIs. This indicates that he is still not into over training.
Lets just say, after 2 weeks he remeasures and has 1/4 inch growth. This of course is the ultimate Positive PI, and he should STAY with his routine until he stops growing.
Then, and only then would increased force/time be called for.
Lets take a different scenario;
John Q Dickpuller has read the latest technique of hanging a bowling ball off his dick and decides to give it a try.
First thing he notices is after the work out , his unit turtles up on him (Neutral PI). Later on he sees that morning and nite wood is gone.
Finally, when he measures in about a week, he sees he has lost a half inch in length. This bottom line Negative PI indicator tells him he is way into over training!
The turtling, interpreted in light of the loss of size and loss of nite and morning wood, is a Negative PI for him.
John now knows that that contraction of his penis immediately after his workout is an early indicator of over training his unit.
He lays off completely and waits for his normal nite and morning wood to return, which it does in about one week.
This is a good indicator that he has recovered from the excessive trauma and is ready get back in the game.
John now tries again, this time with a tennis ball. He sees that after his workout he gets slight shrinkage, that only lasts for 30 minutes.
He finds his nite and morning wood improves, and after 2 weeks sees that he is starting to gain size.
John now knows that contraction for 30 minutes or less, is an early Positive PI for him, and keeps that in mind whenever he makes any changes to his routine.
Lets use a third, more complex scenario;
Mr B. Dog finds that if he whacks his dick with a hammer, it turns purple, and shrinks up for a week. He loses his erections completely.
Wisely, he decides to leave it completely alone for 4 weeks.
Slowly his nite and morning erections return, his flaccid hang is now longer than before.
He find whens he is fully recovered, he has gained a half inch in length and and inch in girth.
Here we have a definite Negative PI and a Neutral PI, but interpreted in the light of the final PI (that is, gains), we can say that for Dog, a shrunken and purple penis is a positive indicator of future growth for him, if he takes the time to fully recover.
Recovery is determined by return of definite Positive PIs.
S. Knucklehead decided to try pumping. He is making slow and steady gains. His nite and morning wood is excellent, best in years. He also finds that his day time flaccid hang is longer than ever and fluffed out most of the day.
Mr K knows from this experience that a longer, fluffed flaccid is a Positive PI for him that he is "in the zone".
Mr Knuckhead decides to supercharge his pumping session by doing it while clamped.
This technique not only feels great, it causes his dick to swell to all time new size with no lymphatic fluid (during the PE)!
Knucklehead gets so enthusiastic that he does it for 5 sessions in one day!
That nite Mr K. finds his wood is gone, as well as the mornings. He also finds that his penis is hanging shorter and more contracted.
He measures himself over the next week and finds that he has lost a full one half inch.
So even though he found that his unit was huge during the pumping, the resulting definate Negative PI's indicated that it was more trauma than his unit could handle.
Mr K. learned that a swollen dick during PE could be a definite Negative PI for him!
Mr K took a week off and waited for nite and morning wood, as well as normal flaccid hang to return to normal (Positve PIs).
Mr K restarted his program, but with 5-10 minutes of clamped pumping. He carefully watched his PIs for indications of over training before adding any force/time.