From my understanding, a good credit rating includes no bad debts, no defaults AND has a history of borrowing plenty of money (eg home loan, business loans, many credit cards, mobile phones etc) and of course ability to service more debt.
But I stand to be corrected by someone thats works in the industry.
Sounds good in theory... and all possible IF you live in the USA. In Australia we don't get assigned a credit 'score' (as the Americans call it now) because insufficient information is available in Australia due to privacy laws. In essence, there is very little positive info that is publicly available about credit applicants (unlike in the USA), although it is easy for a credit issuer to get hold of negative info.
The main source of info is Veda Advantage but the Veda database is thin, especially if you are a good risk.
Veda's file:
a) Keeps records of the names of organisations to which you have applied for credit (eg banks, credit card issuers, mobile phone companies, Foxtel etc)
b) Does NOT hold details of the applications (eg whether credit was granted, amount of credit etc)
c) Keeps records of your defaults (but only if the defaults are serious - in essence, if you pay up after a second reminder letter, you are not considered to have defaulted)
d) Automatically deletes all records that are more than 5 years old
e) Is purely commercial (so it does not contain criminal records etc)
A bank's main information source when it issues a credit card is the info you supply on the card application form. Of course, if you are already a customer of the bank, info about your housing loan etc will be available to the bank internally.
Banks don't generally swap info about non-housing consumer loans with one another - it gets very messy with respect to privacy laws etc.
Real estate loans (eg home loans), however, are public information that is registered on the property title when the home loan is issued. However, it is not all that likely that a bank will search this information (available from lands titles records, held by State governments) in order to verify a credit card application - too much hassle and cost, especially if you don't tell the bank about all of your real estate holdings/loans in the first place.
The banks are far more interested in whether you have a default record and default records are easy to get hold of.
So the whole system in Australia works on a combination of 'negative' reports, if any. If your record is clean at Veda and your card application looks normal, chances are your application will succeed.
Employer checks are also becoming difficult - many employers will not discuss staff matters with the credit departments of banks, especially if all the bank does is call the employer by phone. The employer can be in strife, privacy wise, if the employer so much as reveals the name of a current employee without the employee's permission, let alone the employee's salary etc. In practice, the bank caller cannot prove over the phone to an employer that the employee has granted permission for his confidential info to be discussed.
By the way, the reason credit card applications ask for your driving licence number is that Veda uses this as a primary means of indexing your record.