## The worst circuit in the world

“The most miserable latch that’s ever been designed in the history of mankind or before.”

Astronaut Jack R. Lousma commenting on some equipment issues during the NASA Skylab 3 mission (July to September 1973), quoted in Cooper 1976: 41

What does the worst circuit that’s ever been designed in the history of humankind or before look like? Without further ado, here it is:

‘But wait,’ I hear you say, ‘isn’t this the circuit intended for obtaining the data for plotting current-potential difference characteristic curves as recommended by the AQA exam board in their GCSE Physics and GCSE Combined Science specifications?’ (AQA 2018: 47)

### Why is ‘the standard test circuit’ a *bad* circuit?

The point of this required practical is to get several paired readings of potential difference across a component and the current through a component to enable us to plot a graph (aka ‘characteristic’) of current against potential difference. Ideally, we would like to start at 0.0 volts across the resistor and measure the current at (say) 1.0, 2.0, 3.0, 4.0, 5.0 and 6.0 volts. That is to say, we would like to treat the potential difference as the independent variable and adjust it in consistent, regular increments.

Now let’s say we use a typical school rheostat such as the one shown below as the variable resistor in series with the 10 ohm resistor. The two of them will behave as a potential divider circuit (see here and here for posts on this topic).

The resistance of the variable resistor can be varied between 0 and 16 ohms by moving the slider. When the slider is at A it will have the maximum resistance of 16 ohms and zero when it is at C, and in-between values at any other point.

When the slider is at C, the 10 ohm resistor gets the full potential difference from the supply and so the voltmeter will read 6.0 V and the ammeter will read (using I=V/R) 6.0 / 10 = 0.6 amps.

When the slider is at A, the total resistance of the circuit is 10 + 16 = 26 ohms so the ammeter reading (again using I=V/R) will be 6.0/26 = 0.23 amps. This means that the voltmeter reading (using V=IR) will be 0.23 x 10 = 2.3 volts.

This means that the circuit as presented will only allow us to obtain potential differences between a minimum of 2.3 V and a maximum of 6.0 V across the component by moving the slider between B and C, which is less than ideal.

### ‘It is a far, far better circuit that I build than I have ever built before…’

It is a far, far better thing that I do, than I have ever done.

Charles Dickens, ‘A Tale of Two Cities’

This circuit is a far better one for obtaining the data for a current-potential difference graph. This is because we can access the full 0.0 V to 6.0 V of the supply simply by adjusting the position of the rheostat slider. The rheostat is being used as a potential divider in this circuit rather than as a simple variable resistor.

When the slider is at B, the voltmeter will read 0.0 V and the current through the 10 ohm resistor will be 0.0 amps. A small movement of the slider from B towards C will increase the reading of the voltmeter to (say) 1.0 V and the ammeter would read 0.1 A. Further small movements of the slider will gradually increase the potential difference across the resistor until it reaches the full 6.0 V when the slider is at C.

A-level Physics students are expected to be able to use this circuit and enumerate its advantages over the ‘worst circuit in the world’.

And, to be fair, AQA do suggest a workaround that will allow GCSE student to side-step using ‘the worst circuit in the world’:

If a lab pack is used for the power supply this can remove the need for the rheostat as the potential difference can be varied directly. The voltage should not be allowed to get so high as to damage the components, check the rating of the components you plan to suggest your students use.

AQA 2018: 16

If this method is used, then in effect you would be using the ‘built in’ rheostat inside the power supply.

### So why not use the superior potential divider circuit at GCSE?

The arguments in favour of using ‘the worst circuit in the world’ as opposed to the more fit for purpose potential divider circuit are:

1. The ‘worst circuit in the world’ is (arguably) conceptually easier than the potential divider circuit, especially if students have not studied series and parallel circuit before. This allows more freedom in sequencing when IV characteristics are taught.
2. A fuller range of potential differences can be accessed even using the ‘worst circuit in the world’ if the maximum value of the variable resistor is much larger than the resistance of the component. For example, if we used a 0 – 1 kilo-ohm variable resistor in series with the 10 ohm resistor then very fine adjustments of the variable resistor would allow a suitable range of potential difference to be applied across the component.
3. Students are often asked direct questions about the ‘worst circuit in world’.

In the next post, I will outline how I introduce and teach this required practical — using, to my shame, ‘the worst circuit in the world’ — and also supply some useful resources.

You can read part 2 here.

REFERENCES

Cooper, H. S. F. (1976). A House In Space. New York: Bantam Books

## Part one: general principles

He knew all the tricks: dramatic irony, metaphor, pathos, puns, parody, litotes* and . . . satire. He was vicious.

Monty Python, The Tale of the Pirhana Brothers

As we all know, students really struggle with questions in science exams which require answers written ‘at paragraph length’ (dread words!). What follows are some tips that I have found useful when coaching students to improve performance.

Many teachers of English enjoy great success with acronyms such as PEEL (Point. Example. Explain. Link). However, I think these have limited applicability in Science as the required output of extended writing questions (EWQs) varies too much for even a loose one-size-fits-all approach.

What I encourage students to do is:

### 1. Write in bullet points

The bullet points (BPs) should be short but fully grammatical sentences (and not single words or part sentences).

The reason for this is twofold:

• Focus: it stops an attempted answer spiralling out of control. Without organising my answer using BPs, I find myself running out of space. I start with the best of intentions but realise, as I fill in the last remaining line of the allocated space, that I haven’t reached the end of the first sentence yet!!!
• Organisation: it discourages students from repeating the same thing again and again. I have sometimes marked extended writing answers that repeat the same point multiple times. Yes, they have filled the space and yes, they have written in complete sentences. But there is no additional information except the first section rewritten using different words!

### 2. Use correct scientific vocabulary

Students often make the incorrect assumption that ‘Explain‘ means ‘Explain to a non-specialist using jargon-free everyday language‘.

In fact nothing could be further from the truth. The expectation of EWQs in general is that students should be able to communicate to a scientist-peer using technical language appropriate for GCSE or A-level.

Partly, this misconception is our own fault. When students ask for an explanation from their teachers, we often — with the best of intentions! — try to express it in non-threatening, jargon-free language.

This is the model that many students follow when responding to EWQs. For example, I remember groaning in frustration when marking an A-level Physics script where the student has repeatedly written the word ‘move’ when the terms ‘accelerate’ or ‘constant velocity’ would have communicated her understanding with far more clarity.

In Science, what is often derided as ‘jargon’ isn’t an actual barrier to understanding. In truth, a shared, specialist language is an essential pathway to concision and clarity and a guard-rail against inadvertent miscommunication.

### 3. Write as many BPs as there are marks

For example, students should aim to write 3 BPs in response to a 3-mark EWQ.

### 4. Read all your BPs. Taken as a whole — do they *answer* the damn question?

If yes, move on. If no, then add another BP.

## Part two: modelling the EWQ response-process

‘What does “quantum” mean, anyway?’

Terry Pratchett, Pyramids

This EWQ has 3 marks, so we should aim for 3 BPs.

I use the analogy of crossing a river using stepping stones. One stepping stone won’t be enough but three will let us get across — hopefully without us getting our feet wet.

Let’s write our first BP. I suggest that students begin by stating what they may think is obvious.

Next, we think about what we could write as our second BP. But — and this is essential! — we consider it from the vantage point of our first BP.

Our second BP is the next-most-obvious-BP: what happens to the solenoid when an electric current goes through it? Remember that we are supposed to use technical language, so we will call a solenoid a solenoid, so to speak.

Next, we consider what to write for our third (and maybe final) BP. Again, we should be thinking of this from the viewpoint of what we have already written.

Finally, and this point is not to be missed, we should look back at all the BPs we have written and ask ourselves the all-important ‘Have I actually answered the question that was asked originally?

In this case, the answer is YES, we have explained why the door unlocks when the switch is closed.

This means that we can stop here and move on to the next question.

*Litotes (LIE-tote-ees): an ironic understatement in which an affirmative is expressed as a negative e.g. I won’t be sorry to get to the end of this not-at-all-overlong blog post.

## Teaching Newton’s Third Law

Newton’s First and Second Laws of Motion are universal: they tell us how any set of forces will affect any object.

If the forces are ‘balanced’ (dread word! — saying ‘total force is zero’ is better, I think) then the object will not accelerate: that is the essence of the First Law. If the sum of the forces is anything other than zero, then the object will accelerate; and what is more, it will accelerate at a rate that is directly proportional to the total force and inversely proportional to the mass of the object; and let’s not forget that it will also accelerate in the direction in which the total force acts. Acceleration is, after all, a vector quantity.

So far, so good. But what about the Third Law? It goes without saying, I hope, that Newton’s Third Law is also universal, but it tells us something different from the first two.

The first two tell us how forces affect objects; the third tells us how objects affect objects: in other words, how objects interact with each other.

The word ‘interact’ can be defined as ‘to act in such a way so as to affect each other’; in other words, how an action produces a reaction. However, the word ‘reaction’ has some unhelpful baggage. For example, you tap my knee (lightly!) with a hammer and my leg jerks. This is a reaction in the biological sense but not in the Newtonian sense; this type of reaction (although involuntary) requires the involvement of an active nervous system and an active muscle system. Because of this, there is a short but unavoidable time delay between the stimulus and the response.

The same is not true of a Newton Third Law reaction: the action and reaction happen simultaneously with zero time delay. The reaction is also entirely passive as the force is generated by the mere fact of the interaction and requires no active ‘participation’ from the ‘acted upon’ object.

I try to avoid the words ‘action’ and ‘reaction’ in statements of Newton’s Third Law for this reason.

If body A exerts a force on body B, then body B exerts an equal and opposite force on body A.

The best version of Newton’s Third Law (imho)

In our universe, body B simply cannot help but affect body A when body A acts on it. Newton’s Third Law is the first step towards understanding that of necessity we exist in an interconnected universe.

### Getting the Third Law wrong…

Let’s consider a stationary teapot. (Why not?)

We can reject this as an appropriate example of Newton’s Third Law for two reasons:

• Reason 1: Force X and Force Y are acting on a single object. Newton’s Third Law is about the forces produced by an interaction between objects and so cannot be illustrated by a single object.
• Reason 2: Force X and Force Y are ‘equal’ only in the parochial and limited sense of being merely ‘equal in magnitude’ (8.2 N). They are very different types of force: X is an action-at-distance gravitational force and Y is an electromagnetic contact force. (‘Electromagnetic’ because contact forces are produced by electrons in atoms repelling the electrons in other atoms.) The word ‘equal’ in Newton’s Third Law does some seriously heavy lifting…

### Getting the Third Law right…

The Third Law deals with the forces produced by interactions and so cannot be shown using a single diagram. Free body diagrams are the answer here (as they are in a vast range of mechanics problems).

The Earth (body A) pulls the teapot (body B) downwards with the force X so the teapot (body B) pulls the Earth (body A) upwards with the equal but opposite force W. They are both gravitational forces and so are both colour-coded black on the diagram because they are a ‘Newton 3 pair’.

It is worth noting that, applying Newton’s Second Law (F=ma), the downward 8.2 N would produce an acceleration of 9.8 metres per second per second on the teapot if it was allowed to fall. However, the upward 8.2 N would produce an acceleration of only 0.0000000000000000000000014 metres per second per second on the rather more massive planet Earth. Remember that the acceleration produced by the resultant force is inversely proportional to the mass of the object being accelerated.

Similarly, the Earth’s surface pushes upward on the teapot with the force Y and the teapot pushes downward on the Earth’s surface with the force Z. These two forces form a Newton 3 pair and so are colour-coded red on the diagram.

We can summarise this in the form of a table:

### Testing understanding

One the best exam questions to test students’ understanding of Newton’s Third Law (at least in my opinion) can be found here. It is a really clever question from the legacy Edexcel specificiation which changed the way I thought about Newton’s Third Law because I was suddenly struck by the thought that the only force that we, as humans, have direct control over is force D on the diagram below. Yes, if D increases then B increases in tandem, but without the weighty presence of the Earth we wouldn’t be able to leap upwards…

## What to do if your school has a batshit crazy marking policy

I’m glad to say that I don’t have to do this kind of thing any more, as my current school has a sensible marking and feedback policy.

For those of us who are less fortunate, however:

### 1. Don’t Panic

Refer SLT/HoD to Markopalypse Now or Adam Boxer’s Markageddon.

### 2. Me and My Class, Tick-boxing

Read (just read) six exercise books at random from your teaching group. Type three ebi’s and www’s and print as a label in the approved format with boxes to tick. Leave a blank space in the www and ebi section to write in the occasional bespoke comment.

Get class to hand in their exercise books held open to the page you intend to mark. If you have been able to prepare the marking labels in advance, get the class to glue them in at this point.

You will find an example label in Word format here.

Huge time-saving tip: don’t copy and then cut and paste multiple copies of this into the same document file. Instead, just type “1,1,1,1” into the page range…

…and then select “4 pages per sheet” for 4 crisp, identical copies on 1 one side of A4. (Thanks to Adam Boxer for this tip!)

### 3. The Joy of Excel (and Mail Merging)

This system is especially useful when your school’s marking policy demands that students’ target grades and grade awarded for the assessed work is recorded on the feedback form.

Set up an Excel spreadsheet similar to the one below. There is a generic one available here.

Go through the student exercise books and type in comments into the spreadsheet. This sounds onerous but what you will find after marking, say, three books is that many of the comments can be directly re-used by copying and pasting directly into the relevant cell.

Then, set up a marking feedback form in Word similar to this one:

Next, use the Mailings menu or the Mail Merge Wizard to (1) identify the spreadsheet as the data source; and (2) transfer the data and comments from the spreadsheet to the Word document.

If you have done this correctly, it will look like this:

Then Merge the data to produce a document that looks like this:

Print using the 4 pages per sheet option as above or similar. Then get students to glue into their own books and complete the ebi/DIRT activities.

The other advantage of this is you can print off the Excel spreadsheet and file in your mark book.

### And finally…

Hopefully, fewer and fewer teachers will need these tips as understanding of the proper role of marking and feedback permeate through the school system, but I know many schools are still demanding ‘triple marking’ when, in all truth, they shouldn’t be.

## Assessment Will Eat Itself

Laura then took me to her classroom, where piles of coursework were strewn across every table, and showed me what she has to mark. She has 29 students’ work to assess, having to write comments to justify her marks in 7 boxes for each student. That is 203 separate comments with minimal, if any, support from OCR. Page after page of assessment descriptors without any exemplar materials to help Laura, and her colleagues across the country, make accurate interpretations of what on earth the descriptors mean.

This is an example — pure and simple — of assessmentitis.

“-itis” is the correct medical suffix since the assessment system is, indeed, inflamed. Distended. Bloated. Swollen. Engorged. Puffed up.

How did it come to this? When you meet people who work for the examination boards, they are — by and large — pleasant, normal, well-adjusted and well-intentioned people, at least as far as I can judge. How can they produce such prolix monstrosities?

Dr Samuel Johnson made the telling observation that “Uniformity of practice seldom continues long without good reason.” The fact that all the exam boards tend to produce similar styles of document indicates that they are responding to a system or set of pressures that dictate such a response.

I suspect that, at its heart, the system has at least one commendable aim: that of fairness, and that of ensuring that everyone is making similar judgements.

In answer to the age-old question: “But who is to guard the guards themselves?” they have attempted to set up an impenetrable Wall of Words.

But here’s the thing: words can be slippery little things, capable of being interpreted in many different ways. Hence the need to add a comment to give an indication of how one interpreted the marking criteria. It has been suggested that “expected practice” (“best practice” to some) is to include phrases from the marking criteria in the comment on how one applied the marking criteria . . .

This is already an ever-decreasing-death-spiral of self-referential self-referring: assessment is eating itself!

But here’s another thing: if the guards are so busy completing paperwork explaining how they are meeting the criteria of competent guarding and establishing an audit-trail of proof of guarding-competencies — then, at least some of the time, they’re not actually guarding, are they?

Who is to guard the guards themselves? In the end, one has to depend on the guards to guard themselves. Choose them well, trust them, and try to instil a professional pride in the act of guarding in them.

Pride and honest professionalism: they are the ultimate Watchmen.

## Markopalypse Now

AHT VAL: And once you’ve finished marking your students’ books and they have responded IN DETAIL to your DETAILED comments, you must take them in again and mark them a second time using a different coloured pen!

AHT HARVEY: A page that’s marked in only one colour is a useless page!

NQT BENJAMIN: Erm, if you say so. But why?

AHT VAL: It’s basic Ofsted-readiness, Benjamin. Without a clearly colour-coded dialogue between teacher and student, how can we prove that the student has made progress as a result of teacher feedback?

NQT BENJAMIN: But I’ve only got this red biro…

AHT HARVEY GRINS UNPLEASANTLY AND OPENS A CABINET FULL OF PENS OF MANY COLOURS.

AHT HARVEY: In this school we wage a constant battle against teacher sloth and indifference!

(With apologies to The League Of Gentlemen)

I have been a teacher for more than 26 years and I tell you this: I have never marked as much or as often as I am now. We are in the throes of a Marking Apocalypse — a Markopalypse, if you will.

And why am I doing this? Have I had a Damascene-road conversion to the joy of rigorous triple marking?

No. I do it because I have to. I do it because of my school’s marking policy. More to the point, I do it because my school expends a great deal of time and energy checking that their staff is following the policy. And my school is not unique in this.

Actually, to be fair, I think my current school has the most nearly-sensible policy of the three schools I have worked in most recently, but it is still an onerous burden even for an experienced teacher who can take a number of time-saving short cuts in terms of lesson planning and preparation.

Many schools now include so-called “deep marking” or “triple marking” in their lists of “non-negotiables”, but there are at least two things that I think all teachers should know about these policies.

1. “We have to do deep/triple marking because of Ofsted”

No, actually you don’t. In 2016, Sean Harford (Ofsted National Director, Education) wrote:

[I]nspectors should not report on marking practice, or make judgements on it, other than whether it follows the school’s assessment policy. Inspectors will also not seek to attribute the degree of progress that pupils have made to marking that they might consider to be either effective or ineffective. Finally, inspectors will not make recommendations for improvement that involve marking, other than when the school’s marking/assessment policy is not being followed by a substantial proportion of teachers; this will then be an issue for the leadership and management to resolve.

2. “Students benefit from regular feedback”

Why yes, of course they do. But “feedback” does not necessarily equate to marking.

Hattie and Timperley write:

[F]eedback is conceptualized as information provided by an agent (e.g., teacher, peer, book, parent, self, experience) regarding aspects of one’s performance or understanding. A teacher or parent can provide corrective information, a peer can provide an alternative strategy, a book can provide information to clarify ideas, a parent can provide encouragement, and a learner can look up the answer to evaluate the correctness of a response. Feedback thus is a “consequence” of performance.

So a textbook, mark scheme or model answer can provide feedback. It does not have to be a paragraph written by the teacher and individualised for each student.

Daisy Christodoulo makes what I think is a telling point about the “typical” feedback paragraphs encouraged by many school policies:

[T]eachers end up writing out whole paragraphs at the end of a pupils’ piece of work: ‘Well done: you’ve displayed an emerging knowledge of the past, but in order to improve, you need to develop your knowledge of the past.’ These kind of comments are not very useful as feedback because whilst they may be accurate, they are not helpful. How is a pupil supposed to respond to such feedback? As Dylan Wiliam says, feedback like this is like telling an unsuccessful comedian that they need to be funnier.

## Look at the pretty pictures…

Uniformity of practice seldom continues long without good reason.

So opined the estimable Dr Johnson in 1775. In other words, if a thing is done in a certain way, and continues to be done in that same way for a number of years by many different people, then it is a pretty safe bet that there is a good reason for doing the thing that way. And this is true even when that reason is not immediately apparent.

For the choice of this situation there must have been some general reason, which the change of manners has left in obscurity.

— Samuel Johnson, A Journey To The Western Islands of Scotland (1775).

Consider the following examples of “uniformity of practice”:

They are fairly bog-standard GCSE examination questions from the last two years from three different exam boards. But compare and contrast with an O-level Physics paper from 1966:

The “uniformity of practice” that leaps out at me is that the more modern papers, as a rule, have many more illustrations than the older paper. Partly, of course, this is to do with technology. It would have been (presumably) vastly more expensive to include illustrations in the 1966 paper.

Even if we assume that the difficulty level of the questions in the modern and older papers are equivalent (and therein lies a really complex argument which I’m not going to get into), there is a vast difference in the norms of presentation. For example, the modern papers seems to eschew large blocks of dense, descriptive text; this extends to presenting the contextual information in the ultrasound question as a labelled diagram.

Now I’m not saying that this is automatically a good or a bad thing, but there does seem to be a notable “uniformity of practice” in the modern papers.

Now what could the “general reason” for this choice?

Rather than leave the “change of manners” responsible for the choice “in obscurity”, I will hazard a guess: the examiners know or suspect that many of their candidates will struggle with reading technical prose at GCSE level, and wish to provide visual cues in order for students to play “guess the context” games.

Now I’m not assigning blame or opprobrium on to the examiners here. If I was asked to design an exam paper for a wide range of abilities I might very well come up with a similar format myself.

But does it matter? Are we testing Physics or reading comprehension here?

My point would be that there can be an elegance and beauty in even the most arid scientific prose. At its best, scientific prose communicates complex ideas simply, accurately and concisely. It may seem sparse and dry at first glance, but that is only because it is designed to be efficient — irrelevancies have been ruthlessly excised. Specialised technical terms are used liberally, of course, but this is only because they serve to simplify rather than complicate the means of expression.

Sometimes, “everyday language” serves to make communication less direct by reason of vagueness, ambivalence or circumlocution. You might care to read (say) one of Ernest Rutherford’s papers to see what I mean by good scientific prose.

The O-level paper provides, I think, a “beginner’s guide” to the world of scientific, technical prose. Whereas a modern question on falling objects might tack on the sentence “You may ignore the effects of air resistance” as an afterthought or caveat, the O-level paper uses the more concise phrase “a body falling freely” which includes that very concept.

To sum up, my concern is that in seeking to make things easier, we have actually ended up making things harder, and robbing students of an opportunity to experience clear, concise scientific communication.

## The Gamesters of Sparta

Sir. It must be considered, that a man who only does what every one of the society to which he belongs would do, is not a dishonest man. In the republick of Sparta, it was agreed, that stealing was not dishonourable, if not discovered.

— Samuel Johnson

At a recent event, the speaker asked us to consider a hypothetical conundrum: what if one GCSE Triple Science student was strong in (say) Chemistry and Biology, but significantly weaker in GCSE Physics?

What course of action would you recommend? Extra support in Physics, was the consensus reply.

Actually, said the speaker, the smart “Progress 8 Maximisation Strategy” would be to:

1. Tell the student to focus her efforts entirely on Biology and Chemistry and completely ignore Physics. . .
2. . . . but keep her entered for GCSE Physics anyway, and make sure that she goes into the exam hall and writes her name on the Physics papers, even if she does nothing else.

That way, she has ostensibly followed a full and balanced curriculum. She has, after all, been entered for all three Science subjects.  And, since Progress 8 counts only the two highest Science grades (or so I’m told), the student’s contribution to the school’s league table position would be also be secure.

H’mm. Dishonest? No. In the school’s best interests? Definitely. In the student’s best interests? Erm . . . on balance, no.

Sadly, as the character Joseph Sisko (ably played by Brock Peters) once observed on Star Trek: Deep Space Nine: “There isn’t a test that’s been created that a smart man can’t find his way around!” And that includes Progress 8 . . .

Sir, I do not call a gamester a dishonest man; but I call him an unsocial man, an unprofitable man. Gaming is a mode of transferring property without producing any intermediate good.

— Samuel Johnson

## They Wouldn’t Let It Lie: The Twelve Physics Pracs of Gove (Part 3)

One time a whole lot of the animals made up their minds they would go shares in building a house. There was old Brer Bear and Brer Fox and Brer Wolf and Brer Raccoon and Brer Possum — everyone right down to old Brer Mink. There was a whole crowd of them, and they set to work in building a house in less than no time.

Brer Rabbit was there too, of course, but he said it made his head swim to climb up the scaffold and build like the others, and he said too that he always got sun-stroke if he worked in the sun — but he got a measure, and he stuck a pencil behind his ear, and he went round measuring and marking, measuring and marking. He always looked so busy that all the other creatures said to each other that Brer Rabbit was doing a mighty lot of work.

And folk going along the road said that Brer Rabbit was doing more work than anyone. But really Brer Rabbit wasn’t doing anything much, and he might just as well have been lying by himself in the shade, fast asleep!

Brer Rabbit Gets A House by Enid Blyton

Of all the things that could be dumped overboard during a radical curriculum overhaul, the dreadful, unholy mess known variously as “controlled assessment” or “coursework” or “practical assessment” (but whose names are actually legion) would certainly get my vote.

So, I was actually faintly encouraged by the reformed A-levels insistence that students have to DO twelve “required” practicals, and that all schools have to provide is evidence that their students have DONE those practicals to allow a “practical endorsement” to be ticked on exam certificates. Assessment of students’ practical skills would be in the final examinations.

In my naivety, I thought that a set of properly written laboratory notebooks would be sufficient evidence for the practical endorsement to be awarded. I actually enjoyed explaining the protocols for keeping a lab book to our AS Physics group; for example, the idea that it should be a contemporaneous working document, replete with mistakes and crossings out — proper science in the raw, so to speak, warts and all. And not a suspiciously pristine, antiseptic and bowdlerised “neat” copy. And I thought our students responded gamely to the challenge, even down to worrying whether the pen with erasable ink counted as an ‘indelible pen” or not.

But, goddammit, the latest email from our exam board shows that the JCQ wouldn’t let it lie, they wouldn’t let it lie.

Now, we have to minutely “track” (dread word!) our students’ practical skills, verily even unto recording onto the Holy Spreadsheet if we have indubitable observational evidence of each student reading an Instruction sheet or not.

Oh deary deary me. It calls to mind Wilfred Owen’s memorable lines about being fit to “bear Field-Marshal God’s inspection”.

But it won’t be Field-Marshal God inspecting us. Instead, it will be a vast floppy-eared army of snaggletoothed practical-assessor-Brer Rabbits, hopping all over the land, measuring and marking, marking and measuring…

I give up: this seems to me like defeat, a return to the discredited and unlamented paradigm of controlled assessment. This is defeat, a totally avoidable defeat that has been snatched from the ravening jaws of victory…

## Educational Defeat Devices

The Volkswagen Emissions Test Defeat Device needs no introduction:

Full details of how [the defeat device] worked are sketchy, although the EPA has said that the engines had computer software that could sense test scenarios by monitoring speed, engine operation, air pressure and even the position of the steering wheel.
When the cars were operating under controlled laboratory conditions – which typically involve putting them on a stationary test rig – the device appears to have put the vehicle into a sort of safety mode in which the engine ran below normal power and performance. Once on the road, the engines switched out of this test mode.
The result? The engines emitted nitrogen oxide pollutants up to 40 times above what is allowed in the US.
BBC News 4/11/15

This perceptive post from cavmaths shows , I think, the danger of relying on widely used educational “best practice” short cuts. They can actually be deleterious to student understanding. In short, many of them are simply “educational defeat devices”, clever tricks designed to give a false impression of student performance under artificial test conditions, cheats that fall apart when tested in the real world.