
The Teaching Stocktake: How to Reduce Learning Shrinkage
Mar 02, 2025Iâve noticed a worrying trend in schools latelyâŠ
With all the pressure to âcatch kids upâ, âprepare for the NAPLANâ, and ensure theyâre âimplementing evidence-based instructionâ, schools are falling into the trap of adopting approaches without first passing them through the âdoes-this-match-with-what-we-know-to-be true-about-teachingâ test.
It seems that in their haste to tick all the latest boxes, schools are forgetting some of the simple truths they know about effective instruction.
Truths such as the fact that assessment should be used to inform teaching. As Ausubel stated back in 1968, âThe most important single factor influencing learning is what the learner already knows. Ascertain this and teach him [or her] accordingly.â
Fascinatingly, our industry isnât the only one that sometimes makes this mistakeâŠ
What teachers can learn from deli workers
My twin sister Shirl has worked in a supermarket since we were teenagers. She started in the deli, moved on to become a cheesemonger and is now a Buyer and Specialist for the deli and bakery departments across all the companyâs stores.
What Shirl doesnât know about stock management, supply and demand, food safety and customer service isnât worth knowing. Sheâs a stickler for following processes and she has trialled, tweaked and trained successful innovations across countless stores.
One time when we were having a chat about our jobs, Shirl voiced her frustration about the way one of colleagues blatantly disregarded the companyâs simple food ordering practices.
âHe didnât even check how much stock we already had in the cabinet before ordering more!ââŻShe said.âŻâAny wonder we end up throwing so much stock out!â
Once she said this, she uttered a sentence that is surprisingly relevant for schools:
âEveryone knows that if you blind order, youâre going to end up with shrinkage.â
Note: âBlind orderâ = to order without checking the current levels of stock. âShrinkageâ = the stock thatâs thrown out because itâs reached the end of its shelf life.
The lesson for schools:
Assess BEFORE you teach.
Do a stocktake of your studentsâ skills, strategies and knowledge before blindly rolling out the entire deck of free âevidence-basedâ PowerPoint slides.
Use the knowledge gained through your stocktake (assessment FOR teaching) to inform decisions around what, when and how you teach.
âŻ
Why teachers should conduct more stocktakes
Just as blind ordering in the deli leads to shrinkage of profit, blind teaching in the classroom leads to shrinkage of potential growth.
When you outsource the planning of your writing lessons, for example, to an external source that doesnât know your studentsâ existing knowledge, you risk wasting precious instructional time reteaching concepts that they already know.
Scarily, researcher Graham Nuthall found in one observational study that âtypically, students already knew at least 40% of what the teachers intended them to learn.â
40%! Now, thatâs a lot of shrinkage!
If, on the other hand, you slow down to take stock of what your students already know about writing, youâll speed up their learning and growth as a result.
Youâll waste less of your studentsâ time teaching concepts they already know. Which means youâll have more time to teach the things they donât know. As a result, youâll end up with much less shrinkage (and much happier co-workers).
âŻ
How to stocktake your students' student writing
The most effective way to do a stocktake on your studentsâ writing is to have them engage in aâŻCold Write.
This simply means asking your students to create a piece of writing in the target genre without receiving any explicit instruction beforehand. (Iâve spoken about this in more length on my blog: 3 Reasons you Should Use Cold Writes In The Classroom)
The purpose of a Cold Write is for your students to show you what they already know about writing in that genre.
As you read your studentsâ Cold Writes, you should efficiently analyse the strengths and weaknesses of their writing. The use of assessment rubrics such as the 6+1 writing traits rubrics can be useful here (especially as theâŻtraits align so neatly to the NAPLAN marking criteria).
Finally, you should use the information gathered, to plan for writing instruction that is targeted directly at your studentsâ needs. E.g.:
- Do your students really need to spend 3 weeks learning about the structure of a narrative, or, is that part of the 40% of content they already know?
- Which part(s) of narrative writing donât they know about?
- Which aspects of narrative writing could you teach to strengthen the quality of their writing?
The final takeaway
Letâs not lose what we know to be true about good teaching.
Assessment should come before instruction. And, the information you glean through assessment should be used to inform your instruction.
Stop blind ordering.
Start stocktaking.
And keep reducing shrinkage.
Tip: If youâre interested in building your capacity to quickly analyse the strengths and weaknesses in your studentsâ writing, I suggest taking a look at myâŻWriting Traits Masterclass. Enrolments close next Sunday and wonât open again until Term 3.âŻClick here to learn more.
âŻ
References:
Ausubel, D. P. (1968).âŻEducational psychology: a cognitive view. Holt, Rinehart and Winston.
Related Blog Posts
Sign up to our mailing list
Join our mailing list to receive the latest news, updates and resources from Oz Lit Teacher.
We'll even give you a copy of our mentor text list to say thanks for signing up.