1. Introduction 2. Testing in the EFL Primary Classroom 3. Differentiation of Written Tests in the EFL Primary Classroom 4. Quality Criteria of Written Tests 4.1 Validity 4.2 Student-Reliability 5. Reflection of Test Creation 6. Conclusion 7. Development of my Professional Vision 8. List of References 9. Appendix 9.1 The Examplary Test 9.2 Differentiated Task