Anyone who has worked as an Assistant Language Teacher (ALT) in Japan, or spoken to others in the role, will quickly notice one thing: no two roles are quite the same.
Some ALTs are actively involved in lesson planning and lead parts of classes. Others take a more limited role, supporting from the side. In some schools, expectations are clearly explained from the beginning. In others, it can take months to understand what is expected.
This variation is often summarised with a simple phrase: ESID — Every Situation Is Different.
It is usually presented as a practical reality of working in Japanese schools. But in many ways, it reflects something more structural.
The Meaning of “Assistant”
At the centre of the ALT role is the word assistant. This is not just a description of classroom behaviour. It is a formal designation that shapes how the role is positioned within the school system.
ALTs are not employed as teachers, even when they have relevant qualifications or experience. Responsibility for classes remains with licensed Japanese teachers, and the ALT role is defined as supporting that structure rather than operating independently within it.
This distinction has important consequences. In most professional settings, roles are clearly defined, with expectations, responsibilities, and lines of accountability set out in advance. In contrast, the ALT position is intentionally broad. The assistant designation allows schools and Boards of Education to interpret the role flexibly, depending on local needs and preferences.
That flexibility can be useful from an administration perspective. It can also lead to significant differences in how the role is experienced.
(We will look more closely at what “assistant” means in practice in a later blog.)
Why ESID Exists
The phrase ESID is often used informally among ALTs, but it reflects a deeper feature of the system.
Education in Japan is decentralised in practice. While national guidelines exist, local Boards of Education have considerable autonomy in how policies are implemented. Schools themselves also operate with a high degree of internal variation, shaped by leadership, staff culture, and local priorities.
At the same time, there is no detailed, standardised definition of the ALT role within national policy. This creates space for interpretation at every level.
In practice, the role is shaped by:
- Boards of Education
- Individual schools
- The ALT’s designated supervisor (often referred to as the ALT tantō)
- The teachers the ALT works with directly
This layered structure means that even within the same city, two ALTs can have very different day-to-day responsibilities.
ESID, then, is not simply a description of variation. It is a predictable outcome of how the system is organised.
The Role Without a Template
Another factor behind this variation is the absence of a shared professional framework for the role.
Most ALTs receive limited formal training before entering schools. Ongoing development also varies widely depending on employer and location. Unlike many teaching roles, there is no universally applied model for how ALTs should be integrated into lessons, departments, or school life.
As a result, expectations are often developed informally, through day-to-day interaction rather than clear initial guidance.
In some schools, this leads to strong working relationships and well-defined roles over time. In others, it can result in ongoing uncertainty.
How This Affects ALTs
For experienced educators, this flexibility can sometimes be navigated with relative ease. Over time, it becomes possible to read the environment, understand expectations, and adapt accordingly.
For newer ALTs, particularly those arriving from outside Japan, the experience can be more challenging.
Many enter the role with expectations shaped by teaching contexts where responsibilities are clearly defined. When those expectations do not match reality, it can lead to confusion or frustration.
In some cases, it can also lead to misunderstandings around behaviour and professionalism. What may be seen as initiative in one context may be interpreted differently in another. Without clear guidance, new ALTs are often left to work this out through trial and error.
This is not a reflection of individual ability, but of how the role is structured, something that becomes increasingly clear after working with ALTs across a wide range of schools in Japan.
A System Built on Variation
One of the most common ways ALTs try to make sense of their experience is by comparing it to others.
Why does one ALT lead classes while another does not?
Why are expectations clear in one school and unclear in another?
These are reasonable questions. But they often assume that there is a single, consistent model behind the role.
In reality, there is not.
The variation in ALT experiences is not simply the result of individual schools or personalities. It is built into the system itself: a flexible role, implemented locally, without a single standard model.
Understanding Before Judging
Because of this, discussions about ALTs often focus heavily on individuals. Some are described as proactive, others as passive. Some schools are seen as supportive, others as difficult.
While these observations can be valid, they can also overlook the broader structure shaping those experiences.
Understanding ESID as a structural feature, not just a phrase, provides a clearer starting point. It allows ALTs to approach their work with more realistic expectations and to focus on adapting to their specific environment, rather than searching for a single “correct” version of the role.
