The arguer claims that all colleges and universities should adopt honor codes similar to Groventon's in order to decrease cheating among students for he/she assumes that, by this system the cheating among students have deceased successfully. Though it may be true that the honor code is useful for the decreasing of cheating, some flaws of the reasoning and unwarranted assumptions make the argument unconvincing.
The first flaw of the argument is that the author assumes that the cheatings are truly decreasing for the reports of cheating are decreasing and a survey indicates that the students would not cheat for this system. Though it may be true, the author does not inform us of how many students are questioned in this survey and if the samples are selected randomly. Even if the survey is conducted representatively, it is entirely possible that the report of cheating is far less than the cheating really happened. Because if a student cheating in an exam, he/she would not get a degree. As a result, they may not report the cheating even if they witnessed that for the punishment is so severe. Lacking such evidence to substantiate, the assumption the author draws is not valid.
The second flaw of the conclusion is that the arguer hastily advises all of the colleges and universities should follow this change similarly. Though it may be a good advice, the arguer unfairly assumes that they are comparable to Groventon. It is entirely possible that the students and management of these colleges and universities are totally different. If an unsuitable policy is applied, there may be counterproductive effects. The cheatings in its school may increase rather than decrease if the college adopts the honor codes. Without more information about the similarities among these colleges, the arguer can not hastily conclude.
Last but not the least, the author claims that it is the honor codes that leads to the decreasing. The honor code may be a useful method, but there is no information about how it really functions. There can also be other factors affect the cheating in Groventon. Maybe they rises the punishment at the same time or they have made many announcement about being honest when taking exams. The author unfairly establishes a cause-and-effect relationship between the decrease of cheating and honor codes. And without ruling out other possible factors, the author can not come to the conclusion.
To sum up, though the author's conclusion of the adoption of other colleges can be really beneficial, because lacking more evidence about the cause of decreasing and how effectiveness the code honor acts, the author fails to substantiate the argument.