Under the method described, the price parameter could be:

    * an offer per impression,
    * an offer per selection,
    * an offer per conversion,
    * a maximum offer per impression,
    * a maximum offer per selection, and;
    * a maximum offer per conversion.

Relevancy of an ad to a page can be determined by:

    * Determining concepts (probabilistic hierarchical inferential learned clusters) of the document,
    * Determining a set of one or more ads with the determined concepts, and;
    * Obtaining targeting information (keywords) from at least some ads belonging to the set of one or more ads.

The performance parameter associated with the ads can be based upon: