Not a black box. Here's the actual system, and why it uses letters the way it does.
Every reading starts with the same question: how does a name — just letters, arranged in a particular order — turn into a number at all? It's worth actually explaining, rather than asking you to take it on faith.
The system used here works from the 26-letter English alphabet, with each letter assigned a digit from 1 to 9 in a fixed, repeating sequence. It's not arbitrary — the same underlying logic that reduces any larger number down to a single digit (add the digits together, and keep going until one digit remains) is applied to the alphabet itself: 26 letters reduce to 2+6=8. That's not a coincidence the system ignores; it's part of why the alphabet is treated as a meaningful sequence rather than just a convenient list of symbols.
When you spell a name out and convert each letter to its number, then add those numbers together, you get the name's total — the same total shown worked out in full on the Real Examples page for names like Indira Gandhi and Lee Kuan Yew.
The date of birth is read in two ways. The Corporal Number comes from the day of the month alone, reduced to a single digit. The Vital Number comes from adding every digit in the full date — day, month, and year — together, then reducing that too. Between them, they give a picture of what a person is working with before a name ever enters the equation.
The name is then checked against both. When they're in step, the reading tends to reflect that. When they pull in different directions, that shows up too — and that's usually the more useful thing to actually know.
Two people can be born on the same day and go on to live completely different lives. Something about each of us — call it capacity, call it potential — genuinely varies from person to person, and most of us have no reliable way to measure our own. We can guess. We can compare ourselves to other people. Neither tells us much.
Other methods can describe where you currently stand — what's already happened, what's already fixed. What they tend not to offer is a way to actually close the gap between where you are and what you're capable of. That's the specific thing this method is aimed at: not just telling you your starting position, but giving you something to actually work with — including, where it's relevant, a specific adjustment to a name that isn't serving you well.
Knowing your own tendencies, your own blind spots, and the kinds of situations that tend to go wrong for you isn't a small thing. It's the difference between walking into a decision informed, and walking in guessing.