Is this dock, sorrel or something else?
Homework: What does the Hattie research
actually say?
http://headguruteacher.com/2012/10/21/homework-what-does-the-hattie-research-actually-say/
This is an excellent book. It is an attempt to
distil the key messages from the vast array of studies
that have been
undertaken across the world into all the different factors
that lead to Homework.
As you would hope and expect, the book contains
details of the statistical methodology underpinning
a meta-analysis and the
whole notion of ‘effect size’ that drives the thinking in the book.
There
is a discussion about what is measurable and how effect size can be interpreted
in different ways.
The key outcomes are interesting, suggesting a number of key
factors that are likely to make
the greatest impact in classrooms and more
widely in the lives of learners.
My main interest here is to explore what Hattie says
about homework.
This stems from a difficulty I have when I hear or read,
fairly often, that ‘research shows that homework makes no difference’. It is
cited as a hard fact in articles such as this one by Tim Lott in the Guardian:
Why do we torment kids with homework? Even
though Tim is talking about his 6 year old,
and cites research that refers to
‘younger kids’, too often the sweeping generalisation is applied
to all
homework for all students. It bugs me and I think it is wrong.
Research cited for younger children
I have written about my views on homework under the
heading ‘Homework Matters:
Great Teachers set Great Homework’ . I’ve said that all my instincts as a
teacher
(and a parent) tell me that homework is a vital element
in the learning process;
reinforcing the interaction between teacher and student;
between home and school
and paving the way to students being independent
autonomous learners.
Am I biased? Yes. Is this based on hunches and
personal experience? Of course.
Is it backed up by research……? Well that is the
question.
So, what does Hattie say about homework?
Helpfully he uses Homework studies as an example of the
overall process of meta-analyses,
so there is plenty of material. In a key example, he
describes a study of five meta-analyses
that capture 161 separate studies involving over 100,000
students
as having an effect size d= 0.29. What does this
mean?
This is the best typical effect size across all the studies,
suggesting:
improving the rate of learning by 15% – or advancing
children’s learning by about a year
65% of effects were positive
35% of effects were negative
average achievement exceeded 62% of the levels of
students not given homework.
However, there are other approaches such as the
‘common language effect’ (CLE)
that compares effects from different distributions.
For homework a d= 0.29
effect translates into a 21% chance that homework will make a positive
difference.
Or, from two classes, 21 times out of a 100, using
homework will be more effective.
Hattie then says that terms such as ‘small, medium and
large’ need to be used with caution
in respect of effect size. He is ambitious and
won’t accept comparison with 0.0
as a sign of a good strategy. He cites Cohen
as suggesting with reason that 0.2 is small,
0.4 is medium and 0.6 is large and later argues himself
that we need a hinge-point
where d > 0.4 is needed for an effect to be above
average and d > 0.6 to be considered excellent.
OK. So what is this all saying. Homework, taken as
an aggregated whole, shows an effect size
of d= 0.29 that is between small and medium? Oh.. but
wait… here comes an important detail.
Turn the page: The studies show that the effect size
at Primary Age is d = 0.15
and for Secondary students it is d = 0.64! Well,
now we are starting to make some sense.
On this basis, homework for secondary students has an
‘excellent’ effect. I am left thinking that,
with a difference so marked,
surely it is pure nonsense to aggregate these measures in the first place?
Hattie goes on to report that other factors make a
difference to the results:
eg when what is measured is very precise (eg improving
addition or phonics), a bigger effect is seen compared to when the outcome is
more ephemeral. So, we need to be clear: what is measured
has an impact
on the scale of the effect. This means that we have to throw in all kinds
of caveats about the validity of the process. There will be some forms of
homework more likely to show an effect than others;
it is not really
sensible to lump all work that might be done in between lessons into the
catch-all ‘homework’ and then to talk about an absolute measure of
impact. Hattie is at pains to point out that there will be great
variations across the different studies that simply average out to the effect
size on his barometers.
Again, in truth, each study really needs to be
looked at in detail.
What kind of homework? What measure of attainment?
What type of students?
And so on…. so many variables that aggregating
them together is more or less made meaningless?
Well, I’d say so.
Nevertheless, d= 0.64! That matches my predisposed
bias so I should be happy. q.e.d.
Case closed. I’m right and all the nay-sayers are
wrong. Maybe, but the detail, as always,
is worth looking at. Hattie suggests that the
reason for the difference between the d=0.15
at primary level at d=0.64 at secondary is that younger
students can’t under take unsupported study as well, they can’t filter out
irrelevant information or avoid environmental distractions –
and if they struggle, the overall effect can be negative.
At secondary level he suggests there is no evidence that
prescribing homework develops time management skills and that the highest
effects in secondary are associated with rote learning, practice or rehearsal
of subject matter; more task-orientated homework has higher effects that deep
learning and problem solving. Overall, the more complex, open-ended and
unstructured tasks are, the lower the effect sizes.
Short, frequent
homework closely monitored by teachers has more impact that their converse
forms
and effects are higher for higher ability students than lower ability
students,
higher for older rather than younger students.
Finally, the evidence is that teacher involvement in
homework is key to its success.
So, what Hattie actually says about homework is
complex.
There is no meaningful sense in which it could be stated
that
“the research says X about homework” in a simple
soundbite.
There are some lessons to learn:
The more specific and precise the task is, the more
likely it is to make an impact for all learners.
Homework that is more
open, more complex is more appropriate for able and older students.
Teacher monitoring and involvement is key – so putting students in a position
where their learning
is too complex, extended or unstructured to be done
unsupervised is not healthy.
This is more likely for young children, hence the very
low effect size for primary age students.
All of this makes sense to me and none of it challenges
my predisposition to be a massive advocate for homework. The key is to
think about the micro- level issues, not to lose all of that in a ridiculous
averaging process. Even at primary level, students are not all the
same. Older, more able students in Year 5/6 may well benefit from
homework where kids in Year 2 may not. Let’s not lose the trees for the
wood!
Also, what Hattie shows is that educational inputs, processes and
outcomes are all highly subjective human interactions. Expecting these
things to be reduced sensibly into scientifically absolute measured truths is
absurd. Ultimately, education is about values and attitudes and we need
to see all research in that context.
PS. If you are reading this from Sweden, Tack för
läsning. Låt mig veta era tankar om denna fråga.
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