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About SLT info

SLT info is an educational resource about speech, language, voice and communication.

What we publish

We write explanatory guides on topics that students, clinicians, teachers and families regularly look up: caring for the voice, measuring vocabulary use in a language sample, understanding test scores and norms, interpreting acoustic measures, the sound system of English, and how to find speech therapy in Singapore.

How the guides are written

• Original text. Each page is written for this site. Nothing is copied from other websites or from earlier versions of this domain.
• Sources named. Pages that quote figures or methods list the publications they rely on, so you can check them.
• Limits stated. Norms and cut-offs depend on the task, software and population. We say when a value is approximate and recommend using the reference data that comes with your own test or software.
• Corrections welcome. If you spot an error, please tell us through the contact page.

History of the domain

The sltinfo.com domain hosted a speech and language therapy information site for many years. This relaunch is a new, independently written resource and is not affiliated with the previous owners or authors. If you arrived from an older link and cannot find a page, the closest current guide is usually listed on the home page.

Our aim

To make the science and practice of human communication easier to understand, for students, clinicians, teachers and families. We explain ideas, show how measures are calculated, and are open about what the evidence can and cannot tell you.