Pearson Homework Answers

[Jason]

PearsonEducation runs a large set of web applications that colleges use to automate their tedious ABET required courses. I was stuck in onemy senior year and noticed that they checkhomework answers client side.

I considered looking at how the appletworked using a decompiler or debugger but quickly realized how big of a pain it would have been asthe applet is over 1 MB. Instead, I looked at other files the applet uses.

At this point I made a pretty confident hypothesis of how the flash application works. It reads this XML file to generate the markup for all the homework problems. It then recursively follows this definition tree to figure out what theanswers are. It also is calculating the answers on the fly, meaning no free lunch for the lazy student. Aftersolving the homework problem the honest way, I manually solved the tree of definitions and found the correct answer, which confirmed my hypothesis.

For this case, it would require someone to go through more work recursing throughan XML file than it would be to just do the homework. Alternatively, someone could write a program to automate it -but who knows how much work that would be, as it would be equivalent to rewriting Pearsons Flash applet.

IMPORTANT: Printed answers should NEVER be distributed to students or posted on the Web. Printed answers are protected under copyright laws. Answers printed using the instructions below are for instructors' convenience only.

By default, the Quiz and Test categories do not allow students to print a quiz or test assignment; but the Homework category does allow students to print a homework assignment (with correct answers for the parts they have completed).

The same copyright protection applies when students print assignments either before or after they complete them. These questions or answers should not be shared or distributed in any way. They are provided strictly for students' personal use to study later.

I teach physics. Back in the 90's, people teaching freshman physics were pioneers in creating open-source systems such as LON-CAPA for checking students' homework answers. Today the use of open-source or home-grown systems has become uncommon and has largely been replaced by the use of MasteringPhysics, a product of Pearson which functions both as a revenue stream for the publisher (students pay per semester) and as a way of killing off used textbook sales. During this same period of time, we've seen the advent of web sites such as Chegg that sell students access to answers to homework. Physics homework seems to be the killer app for Chegg. If you read about Chegg et al. in the media (example), physics homework seems to be a dominating presence.

It seems unlikely to me, given what I've read in the media and what I've heard from students. However, I'm not in a great position to evaluate this for myself. In my classes, I use an open-source system rather than MasteringPhysics, and I also haven't paid for access to Chegg, so although I can search for the text of a problem in a printed book and see it pop up in Chegg, I can't see what the solution is. I also don't have access to the text of the problems in MasteringPhysics, so I can't search on the text of those problems. My impression is that most of the problems in MasteringPhysics are actually just minor variations on the problems in the printed text, but I don't actually know for sure. I wonder whether this statement by Palazzo is out of date, or was perhaps unrealistic even in 2010 and influenced by assurances from Pearson's sales reps. From what I can tell, Chegg's business model is designed to make it practically impossible for a textbook publisher to do what Palazzo claims Pearson does. It seems like it would be an endless game of whack-a-mole.

Before I had even finished explaining the question, some of them were already laughing. They say that 100% of MasteringPhysics questions are on Chegg, including both the conceptual questions and the quantitative ones.

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