An adaptive resource indexing and lookup method for a customer self service system that performs resource search and selection and includes a resource library having selectable resources. The method includes steps of: receiving a current user query for requesting resources; receiving a user context vector associated with the current user query, the user context vector comprising data associating an interaction state with the user; mapping each user query and associated context vector to a sub-set of resources from the resource library; and, generating a response set including the sub-set of resources that are most relevant to the user's query. An adaptive indexing function implementing a supervised learning algorithm is applied for increasing the value of search results for a current user in their context and for enhancing and optimizing the performance of the resource indexing functions by increasing their relevance and specificity for mapping user queries to resources.