--- title: Teachstone's Affiliate Trainer Blog | Guest Blogger description: "Teachstone's guest bloggers come from many backgrounds including teaching, education policy, and research. If you are interested in writing a post please fill out the form on our guest blog application page." --- [![teachstone](https://info.teachstone.com/hs-fs/file-2536557792-png/teachstone-image/teachstone-logo-small.png "teachstone")](http://teachstone.com/) - [myCLASS Login](http://home.teachstone.com/) - [English](https://home.teachstone.com/logins/login) - [Español](https://home.teachstone.com/es/logins/login) # Teachstone's Affiliate Trainer Blog ## Guest Blogger ![](https://info.teachstone.com/hubfs/blank_avatar.png) Teachstone's guest bloggers come from many backgrounds including teaching, education policy, and research. If you are interested in writing a post please fill out the form on our [guest blog application page](https://info.teachstone.com/become-a-guest-blogger). ### Recent Posts ## [How Your Participants can Avoid "Drift" in CLASS Observations](https://info.teachstone.com/affiliateblog/avoiding-drift-in-class-observations) 17 Nov 2016 by [Guest Blogger](https://info.teachstone.com/affiliateblog/author/guest-blogger) [![](https://info.teachstone.com/hubfs/class-lens-girl.jpg)](https://info.teachstone.com/affiliateblog/avoiding-drift-in-class-observations) I have been a CLASS observer and trainer for several years now and I’ve been thinking about the concept of “drift.” Drift happens to people who have passed the reliability test, but over time they start scoring subjectively—they let their biases affect the data. Topics: [Trainer Tips](https://info.teachstone.com/affiliateblog/topic/trainer-tips) [Read More](https://info.teachstone.com/affiliateblog/avoiding-drift-in-class-observations) 1 ### Want to receive blog updates by email? #### Be in the know. Stay connected to Teachstone with our most recent blog posts that apply to you–featuring articles, tips, and updates on trainings. ### Get these blog posts in your inbox! Subscribe by RSS [Blog Feed](http://teachstone.com/feed/) Follow Teachstone - - - - - ### Recent Blog Posts Search Search Google ### View by Topic - [Pre-K (5)](https://info.teachstone.com/affiliateblog/topic/pre-k) - [Trainer Tips (4)](https://info.teachstone.com/affiliateblog/topic/trainer-tips) - [Infant and Toddler (3)](https://info.teachstone.com/affiliateblog/topic/infant-and-toddler) - [K-12 (3)](https://info.teachstone.com/affiliateblog/topic/k-12) - [Anuncios (1)](https://info.teachstone.com/affiliateblog/topic/anuncios) ### View by Author - [Mary-Margaret Gardiner (3)](https://info.teachstone.com/affiliateblog/author/mary-margaret-gardiner) - [Sarah Hadden (2)](https://info.teachstone.com/affiliateblog/author/sarah-hadden) - [Jacquelynn Jauregui (2)](https://info.teachstone.com/affiliateblog/author/jacquelynn-jauregui) - [Sherilyn Crump (1)](https://info.teachstone.com/affiliateblog/author/sherilyn-crump) - [Meghan Cornwell (1)](https://info.teachstone.com/affiliateblog/author/meghan-cornwell) - [Guest Blogger (1)](https://info.teachstone.com/affiliateblog/author/guest-blogger) see all ## Affiliate Trainer Resources For training content-specific questions, as well as technical and affiliate trainer panel support, contact us at [affiliatesupport@teachstone.com](mailto:affiliatesupport@teachstone.com). ### Need Service or Support? **Need Customer Support?** Fill out [this form](https://info.teachstone.com/about-teachstone/contact-us/), give us a call at 866-998-8352, or email [contact@teachstone.com](mailto:contact@teachstone.com). **Want to Learn More about Our Products & Services?** [Request a call](https://info.teachstone.com/talk-to-one-of-our-implementation-experts-request), call us at 877-401-8007, or email us at [learnmore@teachstone.com](mailto:learnmore@teachstone.com). © 2016 Teachstone Training, LLC ## Stay Connected - - - - - - [About Us](http://teachstone.com/about-teachstone/) - [Careers](https://careers-teachstone.icims.com/) - [RETURN POLICY](http://teachstone.com/faq/#return-policy-faq) - [PRIVACY POLICY](http://teachstone.com/privacy) - [TERMS OF USE](http://teachstone.com/terms-of-use) - [WEB ACCESSIBILITY](http://teachstone.com/web-accessibility/) - [PERMISSION REQUESTS](https://info.teachstone.com/permission-requests) - [TRANSLATION REQUESTS](https://info.teachstone.com/translation_requests) - [FAQ](http://teachstone.com/faq) - [CONTACT US](http://www.teachstone.com/about-teachstone/contact-us/) CUSTOMER SERVICE: 866.998.8352 LEARN MORE: 877.401.8007