I was looking everywhere on TpT for a general process-oriented argument essay packet and couldn't find one, so I made one. If you are looking to teach your students each step in the argument writing process, this packet is made for you. I used this packet with both my 7th and 8th graders, my 7th graders had very limited topic choices, and my 8th graders were allowed to choose whichever topic they wished (within reason, of course :)).
These are the steps included:
Step 1: Topic selection
Step 2: Research (including bias, source, and critical analysis)
Step 3: Developing a claim and thesis
Step 4: Organizing body paragraphs
Step 5: Addressing the counterclaim
Step 6: Rough Drafting
Step 7: Revising
Step 8: Editing
I don't know about your middle schoolers, but mine struggle with organization and time management. As such, each page/step is designed for students to be able to use completely self-directed, including an example for several of the steps. Additionally, the academic terminology that goes along with argument writing is embedded!
The free Argument Essay rubric available in my store goes along with the packet quite nicely!