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total words
How fast you speak (measured in words per second).
How smoothly you speak (number of words without disfluencies).
How often you pause when you speak (filled and unfilled pauses).
How often you are repetitive (e.g. reformulations).
How long your phrases (also called 'chunks') are (in words).
How effectively you use pauses (pause-to-speech ratio).
How closely your syllable stress resembles a native speaker.
How closely your vowel sounds resemble a native speaker.
How well you use uncommon words in your response.
How varied your vocabulary is (adverbs, adjectives, etc).
How correctly you use English grammar conventions.
How your response is formed to connect ideas.