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1501: SI - Subordination Index

Subordination Index (SI) is a measure of syntactic complexity which produces a ratio of total number of clauses (main and subordinate) to the total number of utterances (c-units). The SI analysis counts clauses and provides a measure of clausal density. Learn how to score samples for SI using SALT and how to compare SI scores from an individual sample to SI scores of samples selected from the reference databases.

Level: Intermediate
Time to complete: 2 hours

Learner outcomes:

Upon completion of the course the participant will be able to:

  • Describe Subordination Index and how it is used to assess syntax.
  • Score a language sample for SI following the SI scoring rules.
  • Use SALT software to insert SI scores.
  • Use SALT software to compare SI scores to samples selected from the SALT reference database.

Materials Needed:

  • Any copy of SALT 20 or SALT 18 software. Older versions of the software may be used though you may notice differences in the menu structures and the reports.
  • Adobe Reader® or other PDF reader which is needed to view document files.

To access this course:

  • Go to
  • Create a new account or log in to your existing Moodle account. Note that this is not the same as your account.
  • To enroll in this course, scroll to the bottom and click the "Enroll me" button.