This will be my 27th year of teaching high school science. Over the years I have taught chemistry, physics, and physical science. Much has changed over the decades/centuries that I have been in the classroom. The biggest change is the accessibility to information via the internet. With the smart phone, which most students possess, students are able to be both distracted and able to find information quickly.
I have also worked in the chemical industry for over 25 years. I use this experience to model my classroom on what a scientist might encounter on the job. Working as a Good Laboratory Practices (GLP) chemist I have used Standard Operating Procedures (SOPs). I have developed SOPs that I use in my classroom.