Introduction
With the first assessment of the new IB Environmental Systems and Societies (ESS) syllabus taking place in 2026, students and teachers are eager to understand how the course will be examined. Assessment is a crucial part of ESS, as it tests not just your knowledge of ecosystems, sustainability, and human impacts, but also your ability to think critically and apply systems thinking to real-world contexts.
This guide breaks down how ESS will be assessed under the 2026 syllabus, including exam formats, the Internal Assessment (IA), and what examiners are really looking for when awarding marks.
Quick Start Checklist: ESS Assessment Overview
- Paper 1: Data response and stimulus-based questions
- Paper 2: Structured and extended response questions
- Internal Assessment (IA): Individual investigation based on fieldwork or secondary research
- Weighting: Exams + IA combined for final grade
- Command terms: Key for interpreting questions correctly
- HL extension: Additional requirements for Higher Level students
External Assessment (Exams)
ESS is assessed through two written exam papers:
Paper 1
- Focuses on data analysis and stimulus-based material such as graphs, case studies, or environmental scenarios.
- Tests your ability to interpret information, draw conclusions, and apply ESS concepts to new situations.
Paper 2
- Includes short-answer structured questions and longer extended responses.
