17. A computer-implemented system comprising one or more processor-based devices configured to execute: an expertise inference function that infers a first expertise level of a first person who is a first user of a computer-implemented system from a plurality of usage behaviors; an expertise access function that accesses a plurality of expertise levels, wherein each of the plurality of expertise levels are associated with each of a plurality of computer-implemented objects; a discovery function that selects a first computer-implemented object of the plurality of computer-implemented objects, wherein the selection of the first computer-implemented object is performed in accordance with a comparison of the first expertise level of the first person with a second expertise level of the plurality of expertise levels that are associated with each of the plurality of computer-implemented objects; a recommendation delivery function that delivers the first computer-implemented object to the first person; and an explanatory function that delivers to the first person an explanation for the delivery of the first computer-implemented object.
17. A computer-implemented system comprising one or more processor-based devices configured to execute: an expertise inference function that infers a first expertise level of a first person who is a first user of a computer-implemented system from a plurality of usage behaviors; an expertise access function that accesses a plurality of expertise levels, wherein each of the plurality of expertise levels are associated with each of a plurality of computer-implemented objects; a discovery function that selects a first computer-implemented object of the plurality of computer-implemented objects, wherein the selection of the first computer-implemented object is performed in accordance with a comparison of the first expertise level of the first person with a second expertise level of the plurality of expertise levels that are associated with each of the plurality of computer-implemented objects; a recommendation delivery function that delivers the first computer-implemented object to the first person; and an explanatory function that delivers to the first person an explanation for the delivery of the first computer-implemented object. 19. The system of claim 17 comprising the one or more processor-based devices configured to execute: the explanatory function that delivers to the first person the explanation for the delivery of the first computer-implemented object, wherein the explanation references the second expertise level.