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As may be apparent to the reader, how an STD is extracted for an
interactive software is important for user delay prediction. For
example, if Calculator is modeled using only one state, which may
seem like a natural model, the user delay prediction may degrade
as demonstrated for the history-based model. Also, the not-so-good
performance of user delay models for Go and Solitaire can be
partially attributed to modeling them with a single-state STD.
Adding states into the STD has the potential to improve
intra-state consistency and the tradeoff between energy savings
and lazy errors.