ICER 2012: So Good I Don’t Have Time To Blog!

I’m going to try and post when I can but the conference is so good that there’s nothing I can skip. Apologies, I shall try and dump my notes from today when I have a chance!


ICER 2012: Day 0 (Workshops)

Well, it’s Sunday so it must be New Zealand (or at least it was Sunday yesterday). I attended that rarest of workshops, one where every session was interesting and made me think – a very good sign for the conference to come.

We started with an on-line workshop on Bloom’s taxonomy, classifying exam questions, with Raymond Lister from UTS. One of the best things about this for me was the discussion about the questions where we disagreed: is this application or synthesis? It really made me think about how I write my examinations and how they could be read.

We then segued into a fascinating discussion of neo-Piagetian theory, where we see the development stages that we usually associate with children in adults as they learn new areas of knowledge. In (very rough) detail, we look at whether we have enough working memory to carry out a task and, if not, weird things happen.

Students can indulge in some weird behaviours when they don’t understand what’s going on. For example, permutation programming, where they just type semi-randomly until their program compiles or works. Other examples include shotgun debugging and voodoo programming and what these amount to are the student not having a good consistent model of what works and, as a result, they are basically dabbling in a semi-magic approach.

My notes from the session contain this following excerpt:

“Bizarro” novice programmer behaviours are actually normal stages of intellectual development.
Accept this and then work with this to find ways of moving students from pre-op, to concrete op, to formal operational. Don’t forget the evaluation. Must scaffold this process!

What this translates to is that the strange things we see are just indications that students having moved to what we would normally associate with an ‘adult’ (formal operational) understanding of the area. This shoots several holes in the old “You’re born a programmer” fallacy. Those students who are more able early may just have moved through the stages more quickly.

There was also an amount of derisive description of folk pedagogy, those theories that arise during pontification in the tea room, with no basis in educational theory or formed from a truly empirical study. Yet these folk pedagogies are very hard to shake and are one of the most frustrating things to deal with if you are in educational research. One “I don’t think so” can apparently ignore the 70 years since Dewey called the classrooms prisons.

The worst thought is that, if we’re not trying to help the students to transition, then maybe the transition to concrete operation is happening despite us instead of because of us, which is a sobering thought.

I thought that Ray Lister finished the session with really good thought regarding why students struggle sometimes:

The problem is not a student’s swimming skill, it’s the strength of the torrent.

As I’ve said before, making hard things easier to understand is part of the job of the educator. Anyone will fail, regardless of their ability, if we make it hard enough for them.


Conference Blogging! (Redux)

I’m about to head off to another conference and I’ve taken a new approach to my blogging. Rather than my traditional “Pre-load the queue with posts” activity, which tends to feel a little stilted even when I blog other things around it, I’ll be blogging in direct response to the conference and not using my standard posting time.

I’m off to ICER, which is only my second educational research conference, and I’m very excited. It’s a small but highly regarded conference and I’m getting ready for a lot of very smart people to turn their considerably weighty gaze upon the work that I’m presenting. My paper concerns the early detection of at-risk students, based on our analysis of over 200,000 student submissions. In a nutshell, our investigations indicate that paying attention to a student’s initial behaviour gives you some idea of future performance, as you’d expect, but it is the negative (late) behaviour that is the most telling. While there are no astounding revelations in this work, if you’ve read across the area, putting it all together with a large data corpus allows us to approach some myths and gently deflate them.

Our metric is timeliness, or how reliably a student submitted their work on time. Given that late penalties apply (without exception, usually) across the assignments in our school, late submission amounts to an expensive and self-defeating behaviour. We tracked over 1,900 students across all years of the undergraduate program and looked at all of their electronic submissions (all programming code is submitted this way, as are most other assignments.) A lot of the results were not that unexpected – students display hyperbolic temporal discounting, for example – but some things were slightly less expected.

For example, while 39% of my students hand in everything on time, 30% of people who hand in their first assignment late then go on to have a blemish-free future record. However, students who hand up that first assignment late are approximately twice as likely to have problems – which moves this group into a weakly classified at-risk category. Now, I note that this is before any marking has taken place, which means that, if you’re tracking submissions, one very quick and easy way to detect people who might be having problems is to look at the first assignment submission time. This inspection takes about a second and can easily be automated, so it’s a very low burden scheme for picking up people with problems. A personalised response, with constructive feedback or a gentle question, in the zone where the student should have submitted (but didn’t), can be very effective here. You’ll note that I’m working with late submitters not non-submitters. Late submitters are trying to stay engaged but aren’t judging their time or allocating resources well. Non-submitters have decided that effort is no longer worth allocating to this. (One of the things I’m investigating is whether a reminder in the ‘late submission’ area can turn non-submitters into submitters, but this is a long way from any outcomes.)

I should note that the type of assignment work is important here. Computer programs, at least in the assignments that we set, are not just copied in from text. They are not remembering it or demonstrating understanding, they are using the information in new ways to construct solutions to problems. In Bloom’s revised taxonomic terms, this is the “Applying” phase and it requires that the student be sufficiently familiar with the work to be able to understand how to apply it.

Bloom’s Revised Taxonomy

I’m not measuring my students’ timeliness in terms of their ability to show up to a lecture and sleep or to hand up an essay of three paragraphs that barely meets my requirements because it’s been Frankenwritten from a variety of sources. The programming task requires them to look at a problem, design a solution, implement it and then demonstrate that it works. Their code won’t even compile (turn into a form that a machine can execute) unless they understand enough about the programming language and the problem, so this is a very useful indication of how well the student is keeping up with the demands of the course. By focusing on an “Applying” task, we require the student to undertake a task that is going to take time and the way in which they assess this resource and decide on its management tells us a lot about their metacognitive skills, how they are situated in the course and, ultimately, how at-risk they actually are.

Looking at assignment submission patterns is a crude measure, unashamedly, but it’s a cheap measure, as well, with a reasonable degree of accuracy. I can determine, with 100% accuracy, if a student is at-risk by waiting until the end of the course to see if they fail. I have accuracy but no utility, or agency, in this model. I can assume everyone is at risk at the start and then have the inevitable problem of people not identifying themselves as being in this area until it’s too late. By identifying a behaviour that can lead to problems, I can use this as part of my feedback to illustrate a concrete issue that the student needs to address. I now have the statistical evidence to back up why I should invest effort into this approach.

Yes, you get a lot of excuses as to why something happened, but I have derived a great deal of value from asking students questions like “Why did you submit this late?” and then, when they give me their excuse, asking them “How are you going to avoid it next time?” I am no longer surprised at the slightly puzzled look on the student’s face as they realise that this is a valid and necessary question – I’m not interested in punishing them, I want them to not make the same mistake again. How can we do that?

I’ll leave the rest of this discussion for after my talk on Monday.


Great News, Another Group Paper Accepted!

Our Computer Science Education Research group has been doing the usual things you do when forming a group: stating a vision, setting goals, defining objectives and then working like mad. We’ve been doing a lot of research and we’ve been publishing our work to get peer review, general feedback and a lot of discussion going. This year, we presented a paper in SIGCSE, we’ve already had a paper accepted for DEXA in Vienna (go, Thushari!) and, I’m very pleased to say that we’ve been just been notified that our paper “A Fast Measure for Identifying At-Risk Students in Computer Science” has been accepted as one of the research papers for ICER 2012, in Auckland, New Zealand.

This is great news for our group and I’m really looking forward to some great discussion on our work.

I’ll see some of you at ICER!

Click here to go to the ICER 2012 Information Page!