Abstract
This cross-sectional study examines participants’ comprehension of line graphs at different career stages, comparing first-year and third-year pre-service teachers (PSTs) with in-service teachers (ISTs). A 23-item line graph task aligned with Curcio’s framework—Reading the data, Reading between the data, and Reading beyond the data—reveals persistent challenges in Reading beyond the data. ISTs outperformed PSTs, suggesting practical experience enhances interpretation. However, no significant differences emerged between first- and third-year PSTs, challenging assumptions that teacher education fosters progressive development in graph interpretation skills.