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Blog post Part of special issue: The future of educational research in Wales

Action research in the classroom: Applying spacing and retrieval practice

Damian Benney

I have been a classroom teacher for nearly two decades, but have only recently undertaken action research. In this post I describe my experiences with spacing (Bjork & Bjork, 2014; Cepeda et al, 2006; Küpper-Tetzel et al, 2014) and retrieval practice (Agarwal et al, 2012; Rawson et all 2013). I wanted pupils to retain as much of the knowledge covered in my classes as possible. This is because:

  • pupils would view revision as something we did all year rather than a process shoehorned in at the end of the course
  • pupils should find future learning easier if they have readily accessible subject schema to build upon (Deans for Impact, 2015; Bransford et al 2000).

The idea behind spacing is that once a topic has been completed, it is returned to at some later stage in the course. In these ‘spacing lessons’, the teacher doesn’t ‘re-teach’ the topic. Instead, pupils focus on retrieval activities. If pupils can correctly retrieve previously learned information, then this information becomes more retrievable in the future. I designed ‘spacing grids’ for pupils to complete in the spacing lesson. Pupils would retrieve from memory in one colour and then add what is missing in another colour.

Figure 1: An example of a ‘spacing grid’

The   big question I had was, ‘What is the optimum spacing gap between finishing the topic and giving pupils the spacing task?’ After reading a paper by Cepeda et al (2008), I produced a graph that would help me choose the optimum spacing gap between end of study and re-study of a topic based on the gap between our lessons and the GCSE exam. An optimal gap should be long enough that information is actively and successfully retrieved from memory, but not so long that nothing can be retrieved.

Figure 2: The graph that aided the choice of an optimum spacing gap between end-of-study and re-study of a topic

Figure 3: An example of a plotted spacing gap between end-of-study and re-study, added to the graph shown in figure 2

I used the graph to find the optimum spacing gap for each of the seven topics taught during the year. I asked pupils to provide feedback on the experience, and the majority found the spacing lessons useful. Comments included the following.


‘They showed me what I knew and what I didn’t so I could work on certain topics when revising.’


‘Helpful for long term memory instead of completely forgetting it.’


‘We were advised to use different colours so I can revisit them.’


‘I’d forgot the majority of things.’

Through my own reflection I found the in-year revision prepared pupils for future learning. It was easier for pupils to learn topics like bonding when they had the knowledge of common ions and electron structure ‘at their fingertips’. Also, better management of revision filled pupils with confidence. They were aware they knew content from as far back as September, and this boosted their positive perception of the subject.

In August the GCSE results for the class came through, and I was delighted with the attainment of the pupils. I am certain that implementing spacing and retrieval has played a large role in their exam success. We are expanding research into spacing and retrieval practice throughout our school. One key challenge is to ensure that there is ample time to revisit topics. Time needs to be afforded for spacing and retrieval activities, particularly for key subject concepts that are essential for more effective future learning. Unfortunately, however, the actual implementation of adding these activities in the current curriculum is easier said than done.

For more detail on my work in this area see Benney (2016).


Agarwal, P. K., Bain, P. M., & Chamberlain, R. W. (2012). The Value of Applied Research: Retrieval Practice Improves Classroom Learning and Recommendations from a Teacher, a Principal, and a Scientist. Educational Psychology Review, 24(3), pp.437–448.

Benney, D. (2016, September 20) ‘Optimal Time for Spacing Gaps’ [blog post]. Retrieved from

Bjork, E. L. & Bjork, R. A. (2014). Making things hard on yourself, but in a good way: Creating desirable difficulties to enhance learning. In M. A. Gernsbacher, R. W. Pew, L. M. Hough, J. R. Pomerantz (Eds.), Psychology and the real world: Essays illustrating fundamental contributions to society (pp. 56–64). New York, NY: Worth Publishers.

Bransford, J. D., Brown, A. L. & Cocking, R. R. (2000). How People Learn: Brain, Mind, Experience, and School. Washington, DC: National Academy Press.

Cepeda, N. J., Pashler, H., Vul, E., Wixted, J. T. & Rohrer, D. (2006). Distributed Practice in Verbal Recall Tasks: A Review and Qualitative Synthesis. Psychological Bulletin, 132(3), 354–380.

Cepeda, N. J., Vul, E., Rohrer, D., Wixted, J. T. & Pashler, H. (2008). Spacing effects in learning: A temporal ridgeline of optimal retention. Psychological Science, 19(11), 1095–1102.

Deans for Impact (2015). The Science of Learning. Austin, TX: Deans for Impact.

Küpper-Tetzel, C. E., Erdfelder, E. & Dickhäuser, O. (2014). The lag effect in secondary school classrooms: Enhancing students’ memory for vocabulary. Instructional Science, 42 (3), 373–388.

Rawson, K. A., Dunlosky, J. & Sciartelli, S. M. (2013). The power of successive relearning: Improving performance on course exams and long-term retention. Educational Psychology Review, 25(4), 523–548.

Bjork, R. A. & Vanhuele, M. (1992) ‘Retrieval Inhibition and Related Adaptive Peculiarities of Human Memory’. In J. F. Sherry, Jr. & B Sternthal (eds) Advances in Consumer Research 19 (pp.155–160). Provo, UT: Association for Consumer Research.