Don't ignore me totally. Neither of us is totally right. Neither of us is totally wrong.
Since April 2007 (which is why it was new to me)
SCHUFA do a offer "basis-score",
but not to anyone else, only to the person to whom it belongs, to help you judge your overall rating with other institutions. They also offer alternative scores to different industries. This scoring is different per industry and is actually developed with the industry concerned based on different factors of your SCHUFA data, relevant to the industry concerned, which includes private banks, public banks, loan banks, mail-order companies, telecommunications companies, or score as an independent trader yourself. Weighting for the score can be influenced by many things, including lack of data overall. This goes some ways to explain why people may be refused mobile phone contracts for no apparent reason, even though they may think their credit status is good. In most cases, SCHUFA do not provide the score value direct to the trader, but provide empirical data on the consumer from which they calculate their own score according to their own algorithm - for this reason many traders may not make their own determined score available to an applicant, as their formula for its calculation is confidential to them.
Most important of all - you can specifically request the SCHUFA does not pass on your score to a third-party (but you can't stop them accessing your base data)