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A key requirement for effective voice control systems is consistency and clarity with vocabulary. This is crucial because voice control systems rely on accurately recognizing and interpreting spoken commands. If the vocabulary used is inconsistent or unclear, it can lead to misinterpretation of commands, resulting in errors or system failures.

Having a clear and consistent vocabulary helps the system better understand user intent, improving the overall efficiency and user experience. Users expect that their commands will be recognized accurately, which necessitates a stable set of terms that the system can reliably process.

Other factors, such as low-cost implementation or high visual competence, may be important in different contexts or applications but do not directly impact the core functioning of voice recognition technology. The ability to change vocabulary frequently may also enhance the adaptability of a system, but it does not serve as the foundational requirement for effective voice control.