At the beginning of every school year I can bet that you review the scientific method. While there isn't necessarily a specific set of steps that we follow in all branches of science, we want our students to be able to use inquiry and think through the scientific process. One great way to get our students thinking like scientists is by using the CER method.

What is CER?
CER stands for claim, evidence, and reasoning. After being posed with a question or observation, students have to make a claim (similar to forming a hypothesis), provide evidence to support their claim, and explain their reasoning. Getting students to understand CER is important because it helps them think through the scientific process. All claims must have supporting evidence, and students should be able to explain the reasoning behind their thoughts. CER is science literacy for the win!

CER can be applied so many different methods of teaching. It doesn't just have to be for labs! Here are a few ideas on how you can implement the process:
1. Video clips: Find a video clip that poses some sort of question or claim. Have students identify the claim, evidence, and reasoning given in the video. If only a claim is given, have students come up with evidence and reasoning on their own following the clip.

2. Labs: CER is great to implement within the lab process. Students are posed with a question they will test, write out their claim (hypothesis), provide evidence (their data), and reasoning. If you haven't checked out NSTA's ADI books (argument driven inquiry), they follow the CER process and have a lot of great lab ideas. Many of the labs can be found free online, but you have to purchase the book to get the accompanying teacher information. Some free resources can be found at the following links: Biology labs, Chemistry labs, Middle school life science.
You could also give students a magazine ad with a claim (such as Shamwow) and have students design an experiment to test the validity.

3. Socratic Seminars: If you aren't familiar with what a socratic seminar is, it is essentially a class discussion where the facilitator asks open ended questions and encourages class discussion. For me it works best when the class sits in a circle facing each other, and every student is required to contribute to the conversation at least once (give them a grade for speaking). Pose a question to your class, give them time to come up with CER speaking points, and get them talking! Make sure your question is open ended so students don't all come to the same conclusions. A sample question you could pose is "Do you think humans could ever survive on Mars?" While there are only 2 answers to this question (yes or no), there will be a lot of discussion regarding their evidence and reasoning. 

4. Whiteboard sessions: CER works well on mini-whiteboards. I have students set up the whiteboards as pictured below. After groups fill out their whiteboard, have the class face each other in a circle, review the boards, and have a "whiteboard session" where they discuss what other groups came up with. This could supplement a lab or be done as a stand alone activity. It takes some training to get students to give constructive feedback to other groups, but after a few tries they get the hang of it. A sample is shown below.

5. Analyzing journal articles: We all want our students to be better readers. At the high school level, I try and get my students reading journal articles. They can be a lot to digest and asking students to read and summarize them can be daunting. I give students the CER graphic organizer (found below) and have them fill it out as they read. It is a great way for them to organize information as they read. They can also use three different colored highlighters as they read- one color to highlight the claim, a second for any supporting evidence, and a third where they find reasoning/justification.

As teachers, we are always on a budget. Decorating classrooms can get pricey. When I first started teaching I was spending a fortune online and at teaching supply stores to buy science posters so my walls weren't so drab. Since then, I've been creating my own science posters that the library will print for me poster size and laminate. You can see some of my posters in the picture gallery below). It has saved me a bunch of money! I have posters in my store, covering topics such as the rock cycle, cells, scientific variables, and more. Check them out here!  You can buy the whole bundle and save!

I've also complied a list of other posters I have found online for free download:
1. Human Genome Poster- This is great to bring out during my genetics unit. Students can look up which genes and diseases are held on each chromosome.
2. Top 10 Reasons you should take Physics
3. Water Education Posters- many posters available on topics such as groundwater, watersheds, and water quality.
4. Scientific Method- Scholastic has created these posters on the scientific method
5. Earth at Night- Poster from NASA
6. Earth/Mars Comparison poster
7. Earthquakes and Seismology- from IRIS
8. March for Science- 6 free posters to celebrate women in science
9. Physics Central- Fun physics posters that can be purchased or downloaded for free
10. Climate Science Posters- These definitely have a political tone, but if you are teaching about climate change are available for free
11. Renewable Energy Posters- in developing countries
12. Big Telescopes- and why we need them
13. Periodic table for biology- Great for honors/AP students
14. Make a difference with careers in biology poster set
15. Not All Chemists Wear White Coats poster set
16. Periodic Table for Biologists
17. Teaching Tolerance- not science related, but oh so important!
18. Forces of Nature- Poster series of women in science
19. NSTA Infographics- More teacher based than student based, but still colorful and free
20. STEM Role Model Posters- These are 8 beautiful posters of women in STEM!
21. Forces of Nature Posters- from Perimeter Institute.
22. Solar System and Beyond- Poster set from NASA

Enjoy!