The double blind method is an important part of the scientific method, used to prevent research outcomes from being «influenced» by the placebo effect or observer bias. (sciencedaily.com)
You're open to self - experimentation as I believe all good scientists are, that whole observation part of the scientific method. (blog.bulletproof.com)
This product is an excellent resource for students to practice the various parts of the scientific method. (tes.com)