You may have noticed in conversations with others that some people use a word or phrase in almost every sentence: - words like, 'basically'; 'you know what I mean'; 'you know'; 'again' and more recently, 'cool'. During an interview, if these words are used repeatedly, they can negate the impact of your message or presentation and could make it appear that you are a person of limited vocabulary.

'Basically', for instance will probably serve no purpose in the sentence in which is it being used. If you are assuming that the person you are talking to understands the fundamentals of what you are discussing - there is no need to use 'basically' - it does not add to your message at all. Likewise with, 'you know what I mean'.
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Constant repetition of this phrase sounds like you are unsure of your message and are looking for continual reinforcement from the listener. An interviewer who has had a bad day may reply, 'no I don't' - which then would put you in an uncomfortable position. 'Cool' is used very often by people of all ages instead of 'OK' or 'yes I agree'. This is fine if it is used sparingly - continuous use is decidedly un-cool.

One way to test to see whether you use words that are not needed is to either record yourself speaking or ask friends for feedback. Try to ensure that the words you use in the interview situation are the ones that add value - not ones that just fill in gaps or use out of habit.