We do not have any detailed information about the 30 volunteers, e.g. the severity of their insomnia, their physique, etc., thus we could not evaluate if they are representative.

　　The author does not inform us about the volunteers sleep patterns prior to the experiment.

　　How soundly or long a person sleeps, or how tired a person feels after sleep, is irrelevant to whether the person suffers from insomnia.

　　The study fails to inform us how the volunteers felt after sleep during the third week, thus we could not evaluate the actual effect of lavender flowers on sleep.

　　Granted that the volunteers sleep was improved through the three weeks, we cannot ensure it is the lavender that caused the result, other factors could also account for the improvement.

　　The study should include another group of people who do not sleep on such pillows as counterparts.

　　The author cannot hastily conclude that the volunteers insomnia has been thoroughly cured without any follow-up studies.

　　注：题目中括号里的数字表明这句话体现的是提纲中第几号缺陷。

　　无论是gre issue还是gre argument，考生都应该养成写提纲的习惯。这种提纲式的gre写作练习可以帮助考生锻炼写作的逻辑性，而gre写作高分最重要的得分依据就是作文的逻辑性要强。

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