Each instance in the Common20LS is composed of the following elements separated by tabulation:
- Annotator ID
- Annotator age
- Annotator native language
- Annotator native language sub-group
- Annotator native language group
- Annotator education level
- Annotator English proficiency (CEFR)
- Sentence with a "_____________" marker instead of the target complex word or phrase
- Target complex word or phrase
- Index of target complex word or phrase in the sentence
- Candidate simplification 1
- Candidate simplification 2
- The candidate chosen as simplest by the annotator