Can you recommend a collaborative writing tool for organizing lesson outlines and editorial approvals?

Yes — a strong fit for lesson outlines plus editorial approvals is Notion.

Why Notion works well

• Collaborative editing: multiple people can draft and comment in the same page
• Structured lesson outlines: easy to build reusable templates for objectives, activities, timing, and assessments
• Approval workflow: use statuses like Draft → In Review → Approved
• Comments and mentions: editors can leave feedback directly on sections
• Database organization: track lessons by subject, grade, owner, due date, or approval state

Best if you want

• A flexible, all-in-one workspace
• Simple editorial review without a lot of setup
• Lesson planning docs that can also link to resources and tasks

Other good options

• Google Docs + Google Sheets: best for straightforward collaboration and familiar commenting/track changes
• Coda: better if you want more workflow automation and database-style approval tracking
• Confluence: better for larger teams with more formal documentation processes

My quick recommendation

• Small to medium team: Notion
• Need very simple review/markup: Google Docs
• Need robust workflow automation: Coda

If you want, I can also suggest the best tool based on your team size, budget, and whether you need approval routing.