Most of what I write on this blog is, one way or another, about language teaching. This page brings together the posts that sit closest to the classroom: posts about how learners learn, about teaching young learners, about multilingual classrooms, and about the everyday work of observing, assessing and reflecting on lessons. I have written it mainly with practising teachers and student teachers in mind, as well as the teacher educators who work with them.
I have grouped the posts by theme rather than by date (dates refer to the year when a post was created, although many of them have been updated since then). Each entry comes with a short note on when it might be useful. If you are about to observe lessons as part of a practicum, Classroom Observation for language teachers: A how-to guide is probably the best place to begin.
Start here
If you only have time for three posts, these are the ones I would suggest:
Classroom Observation for language teachers: A how-to guide
Learn how to plan, conduct, and reflect on classroom observations with this step-by-step guide for teachers, student teachers, and supervisors.
Understanding the Bottleneck Hypothesis in Language Learning
This post revisits Slabakova’s Bottleneck Hypothesis, which identifies functional morphology as the hardest part of second language acquisition. It critiques early communicative approaches, contrasts drilling with modern practices, and highlights plurilingual competence. Updated 2025 reflections connect research, pedagogy, and AI tools, showing why “easy” and “hard” in language learning depend on context.
Using Linguistic Landscapes to Challenge Monolingual Norms in ELT
The post aims to challenge monolingual practices in language education. Drawing on a recently published study (Schvarcz & Warren, 2025) it argues that recognizing students’ linguistic backgrounds fosters engagement and inclusion.
1. Understanding learners
- Is there a talent for language learning? (2015). Useful when you want to know what language learning aptitude is, how it differs from intelligence, and what its three components (phonemic coding ability, language analytic ability and memory) contribute. The post also argues why aptitude should never be used to decide that someone cannot learn languages.
- On Language Learning Strategies (2015). Useful when you want an overview of what learning strategies are, why they matter, and whether they can be taught, based on a conference in Klagenfurt. It ends with some doubts about adding strategy instruction to teachers’ already heavy load.
- Understanding the Bottleneck Hypothesis in Language Learning (2013). Useful when you are wondering why some grammar (tense, aspect, agreement endings) is so hard to learn, and whether that means learners need drilling. A 2025 update revisits the question in light of usage-based research, focus on form, AI tools and plurilingual competence.
- Time in Language Learning and Teaching (2016). Useful when you want an overview of research on how time shapes language learning, through summaries of the seven articles in a 2017 special issue, with a reviewer’s critical comments.
- What Russian Speakers Find Hard About Greek (According to Their Teachers) (2026). Useful when you teach learners who share a first language, and want to see how knowing both languages can help you anticipate difficulties, without assuming they are predictable.
2. Teaching young learners
- Teaching English to Young Learners: Some insights from the literature (2014). Useful when someone tells you that starting earlier is always better. The post synthesises four studies of age and instructed learning, which suggest modest gains mainly in oral skills, and that late starters tend to catch up.
- Teaching English to Very Young Learners in Greece: When research findings don’t align (2013). Useful when two studies of early English teaching reach different conclusions, and you want to think through why: the programmes, the sensitivity of the studies, the people surveyed, and quality control.
- Teaching English to Young Learners, revisited (2014). Useful when you want a critical reading of the published account of the Greek early English programme, and of what it leaves out, notably any evidence about what children actually learnt.
- The 2014 ELT Journal debate. Useful when you want both sides of the argument about English in primary schools. “Primary English Language Teaching does more harm than good” summarises Fiona Copland’s case for the motion; On the ELT J debate, continued summarises Janet Enever’s response; and Primary ELT: Feedback from the community groups teachers’ reactions to the debate.
3. Multilingual classrooms
- Using Linguistic Landscapes to Challenge Monolingual Norms in ELT (2025). Useful when your school expects English-only lessons, and you want ideas for making learners’ other languages visible, drawing on a study of multilingual schoolscapes by Brigitta Schvarcz and Amber Warren.
- Every Language Is Someone’s World (2026). Useful when you want an accessible introduction to ideas that matter in multilingual classrooms: first languages, languages and dialects, second and foreign languages, plurilingual repertoires and language policy.
- CLIL and Immersion: Some differences (2018). Useful when you need to tell Content and Language Integrated Learning apart from bilingual immersion programmes.
- CLIL in Greece: Uncritical and Unhelpful (2012). Useful when you want a critical view of CLIL: the thin evidence for it, which subjects suit it, who should teach it, and what it means for learners’ first languages.
- Raising children to speak many languages (2020). Useful when you want to read about a study of how parents in mixed-language families discuss raising their children with more than one language.
Language Teacher Psychology

Language Teacher Psychology is an edited collection that Sarah Mercer and I put together, which was published by Multilingual Matters in 2018. Its 19 chapters turn the attention of language learning psychology from learners to teachers: their motivation, identity, cognition, self-efficacy, emotions, agency and resilience.
We put the book together because research had focused mainly on learners, often treating the teacher as just one of many factors in their success. We wanted to redress that balance, and to affirm the value of teachers as professionals and as people.
4. Classroom practice and the teaching profession
- A classroom observation framework (2020). Useful when you are about to observe a class and need to decide what to look for: the context, the learners’ strengths and needs, and the methodological choices behind the lesson, with focusing questions for each and a critical pedagogy dimension.
- Classroom Observation for language teachers: A how-to guide (2023). Useful when you are planning observation visits, from the first meeting with the school to note-taking, debriefing the teacher and reflecting afterwards. It comes with downloadable planning and note-taking templates.
- AI-Assisted Teacher Reflection: Thinking Before, During, and After the Lesson (2026). Useful when you want to think about how AI can support reflection before, during and after a lesson, and what it cannot do. The post draws on Thomas Farrell’s framework and on work in the AI Lang project.
- EFL teachers’ language use for classroom discipline (2013). Useful when you are wondering which language to use for classroom management, and what that choice does to the relationship with your learners. These are reading notes on a study of two teachers in Korea.
- Some Thoughts on Student Evaluation in Greek ELT (2013). Useful when you need to make sense of an assessment policy, and want to ask how well its terms are defined, whether its criteria pull against each other (such as reliability and validity), and whether it is practical.
- The Book I Wanted to Write (But Didn’t) (2026). Useful when you want an insider’s account of how a school coursebook is designed, and how evaluation and production can reshape it. The book in question is a Modern Greek coursebook for the final year of lower secondary school.
- The history of ELT: A different perspective (2015). Useful when the familiar sequence of methods, from Grammar-Translation to Task-Based Learning, seems too tidy. The post discusses Howatt and Smith’s alternative, which divides the history of ELT into periods.
- Revisiting the Target Language Democratisation narrative (2015). Useful when you want to question the familiar story of how ELT came to accept different varieties of English, in light of a 1964 book by Halliday, McIntosh and Strevens.
Looking for more?
For the ideas behind language teaching, see Resources for Applied Linguistics in Language Education and Resources for Complexity in Language Education.
For how ideology shapes textbooks, curricula and classrooms, see Tracing ideology in language education.
To learn more about engaging with research as a teacher, see Resources for Teacher Research Literacy.
Explore the other resource hubs
- Resources for Applied Linguistics in Language Education
- Resources for Complexity in Language Education
- Resources for AI in Language Education
- Resources for Teaching Refugee and Migrant Learners
- Resources for Teacher Research Literacy
- Resources for Research Methods in Language Education
- Resources for Academic Writing
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About me
Achilleas Kostoulas is an applied linguist and language teacher educator at the Department of Primary Education, University of Thessaly, Greece. He holds a PhD and an MA in Teaching English to Speakers of Other Languages from the University of Manchester, UK and a BA in English Studies from the National and Kapodistrian University of Athens, Greece.
His research explores a wide range of issues connected with language (teacher) education, including language contact and plurilingualism, linguistic identities and ideologies, language policy and didactics, often using a Complex Dynamic Systems Theory perspective to tease out connections between them. Some of his work includes the research monograph The Intentional Dynamics of TESOL (2021, De Gruyter; with Juup Stelma) and the edited volume Doctoral Study and Getting Published (2025, Emerald; with Richard Fay), as well as numerous other publications.
Achilleas currently contributes to several projects that bring together his long-standing interests in language education, teacher development, and the social dimensions of language learning. As the coordinator of the AI Lang (Artificial Intelligence in Language Education) expert team at the European Centre for Modern Languages of the Council of Europe, he is active in developing principles and resources to help educators make informed, pedagogically grounded use of AI in their teaching. He also leads the University of Thessaly team of ReaLiTea (Research Literacy of Teachers), a project that supports language teachers to engage with, and contribute to, educational research. Alongside these, he contributes to LocalLing (Revitalisation of Linguistic Diversity and Cultural Heritage), a Horizon-funded initiative for the preservation of heritage and minority languages globally.
In addition to the above, Achilleas is the (co)editor-in-chief of the European Journal of Education and Language Review, and welcomes contributions that explore the dynamic intersections between language, education, and society.
About this post
This blog is a space for slow, reflective thinking about applied linguistics, language education, professional development, and the role of technology in language teaching and learning. Transparency about process, tools, and authorship is part of that commitment.
- I created this page on 24th September 2026. I will periodically revise it to ensure accuracy, so feel free to point out any issues that come to your attention.
- When preparing this page, I used artificial intelligence to support drafting, copy-editing and Search Engine Optimisation. I selected and organised the posts, and retain responsibility for analytical thinking, authorial decisions and wording.
- The views expressed here are personal and do not necessarily reflect those of the University of Thessaly or any other entity with which I am affiliated.
