A harbor-museum team updates the recognizer vocabulary, the reply templates, and the TTS voice in one weekend and cannot tell what helped. How should the next sprint be redesigned?
Select an answer to reveal the explanation.
Short Explanation
Changing ear, brain, and mouth together is a weekend blur—you cannot credit any one fix. Split the sprint into three sequential single-factor runs. One stage at a time, same evaluation set.
Full Explanation
Single-factor control applies across the full ASR–NLP–TTS pipeline, not only inside one stage. Updating vocabulary, reply templates, and TTS voice simultaneously makes attribution impossible. Sequencing three controlled experiments restores interpretability.