21. A computer implemented method for providing assertions regarding an item query, the method comprising: as implemented by one or more computing devices configured with specific executable instructions, determining an assertion associated with a set of search criteria and representative of a modification of the set of search criteria, and wherein the modification of the set of search criteria is determined based at least in part on a previous action of at least one user taken in response to results of a previous query, and wherein the assertion is selectable by an additional user to generate a new query based at least in part on the modification of the set of search criteria corresponding to the assertion; determine a query including the set of search criteria based at least in part on activity of a user computing device; generate a user interface comprising results, corresponding to the determined query including the set of search criteria, and the assertion representative of the modification of the set of search criteria; and transmit the user interface to the user computing device, wherein user selection of the assertion corresponds to a user request to generate a new query based at least in part on the modification of the set of search criteria represented by the assertion and enables generation of the new query based at least in part on the modification of the set of search criteria represented by the assertion.
21. A computer implemented method for providing assertions regarding an item query, the method comprising: as implemented by one or more computing devices configured with specific executable instructions, determining an assertion associated with a set of search criteria and representative of a modification of the set of search criteria, and wherein the modification of the set of search criteria is determined based at least in part on a previous action of at least one user taken in response to results of a previous query, and wherein the assertion is selectable by an additional user to generate a new query based at least in part on the modification of the set of search criteria corresponding to the assertion; determine a query including the set of search criteria based at least in part on activity of a user computing device; generate a user interface comprising results, corresponding to the determined query including the set of search criteria, and the assertion representative of the modification of the set of search criteria; and transmit the user interface to the user computing device, wherein user selection of the assertion corresponds to a user request to generate a new query based at least in part on the modification of the set of search criteria represented by the assertion and enables generation of the new query based at least in part on the modification of the set of search criteria represented by the assertion. 22. The computer implemented method of claim 21 , wherein the determined assertion corresponds to a first assertion, and wherein the computer implemented method further comprises determining a second assertion corresponding to the set of search criteria and determining a prioritization of the first and second assertions.