18. The non-transitory computer-readable medium of claim 15 , wherein at least one of the speech-based conversation and the at least one non-speech-based channel of interaction are established over one of a telephone network, a local area network, Internet, and other communications network.
15. A non-transitory computer-readable medium storing a computer program having instructions for troubleshooting based on a probability distribution model, the instructions comprising: establishing a speech-based conversation with a user; establishing at least one non-speech-based channel of interaction for obtaining behavioral information associated with the product or service during the sub-based conversation; for each of a plurality of component variables describing the current state of the product, maintaining a probability distribution over time based on a state of the sub-based conversation over time and a state of the behavioral information over time; and troubleshooting product by responding based on the probability distribution.