Not for that. It's purpose is to give a rough idea of a player character's alignment at a glance. It uses the alignments detailed in their rulebooks.
I know John is chaotic, but I thought he was more neutral with evil leanings than evil. I'm sure he didn't say he'd kill all his party members and take all the loot :P
Breakdown-this is from half remembered passages in some D and D books, with my own thoughts thrown in-
Lawful good-"Crusader"-champions of justice, paragons. They seek what is right in all things, both on an individual and a societal level. They are determinedly good.
Lawful neutral-"Judge"-someone who has no particular inclination towards good or evil, but will not abide the law of the realm being compromised. Order in all things, everything has it's place. Refuses to be swayed from the order they serve, be it a personal code, a government, whatever.
Lawful evil-"Dominator""Exploiter"-They seek personal betterment by using order, the system, to their own advantage. A good example is Emperor Palpatine from Star Wars. His schemes got him appointed the Emperor and given supreme power, all thanks to 'emergency wartime powers'.
Neutral Good-"Benefactor"-Does the best that a good person can do. Charitable people with no particular inclination towards order or chaos. A priest that spends his days healing the sick simply because they need it is a good example.
Neutral-"Undecided""True Neutral"-several types-confused people. People with a marked lack of conviction one way or another on either scale. and those who are dedicated to neutrality itself on a philosophical level.
Neutral evil-"Malefactor"-Completely out for themselves. Holds no love of order, but neither do they shun it. They will do whatever is necessary for their own advancement. This does not mean they cannot form friendships or attachments, it just means they always look out for themselves first.
Chaotic Good-"Rebel"-Acts as their conscience directs them with little regard for the expectations of others. Does as goodness directs, but has little regard for law. Classic example is Robin Hood.
Chaotic neutral-"Free Spirit"-Individualists to the core. Avoids authority, challenges traditions, values their own liberty but does not seek to defend the liberty of others (that would be Good). Often unpredictable, sometimes dangerously so. The insane are usually of this alignment, or of chaotic evil.
Chaotic Evil-"Destroyer"-A chaotic evil person does whatever greed, or lust, or hatred drives him to do. Entirely unpredictable, violent, brutal. True villains. They only care about themselves.
A person often only matches an alignment to a 'T' if they scored every point they could towards it on both scales. For example, John's score shows he he is fairly chaotic and pretty evil. Looking at just that, one could say he greatly cares about himself, perhaps those close to him too, but not much about other people beyond that (evil), and has a problem with authority, being a strong individualist (chaotic). That matches the alignment without being insane (which is how the books portray that alignment). Whether or not it is accurate is subject to argument, of course. One example of such a person might prefer to live in tight-knit family groups with little contact from outsiders other than to gain something, such as by bartering. They might also be slow to trust-ever.