Update roadmap.md

ROADMAP.md

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 # Vision for GitHub Classroom
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-### Phase 1: Upgrade the teacher experience: 
-* Features that enhance the ability for teachers to plan, manage and replicate for future courses.
-* Growth in daily active users and assignment creation. 
 
-### Phase 2: Build a strong, extensible ecosystem: 
+### Phase 1: Build a strong, extensible ecosystem:
 * Expand content platform with Assignments and teacher content contributions.
-* Partnerships: explore partnerships with hardware makers.
 * LTI and Google Classroom integration.
+* GitHub Classroom API.
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+### Phase 2: Classroom allows teachers to assess student work with live feedback:
+* First-class support for teacher feedback.
+* Leverage existing tooling to auto-grade student submissions.
+* LMS integration can provide a fully automated pipeline from submission to grades in teachers' LMS.
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-### Phase 3: Classroom is the best way to learn to code: 
-* The best resources from the best teachers, set up in minutes. 
-* Network effects from well-reviewed problem sets and activities.
-* GitHub Classroom brings real-world experience of all aspects of the app, LMS, notebook and assessment aspects of the Ed tech ecosystem.
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 ## Roadmap
 
 Phase | Theme 1      | Theme 2      | Theme 3  |
 ------| ---------------- | -----------------| ----------- |
-Teacher experience upgrade |“I want to have my whole class ready-to-go on day one.” | “I want to manage and grade my course assignments easily.”  | “I want to reuse my Assignments in future semesters.” 
-Extensible ecosystem | “I want to integrate my tool with Classroom.” |  “I want to find the best exercises for my course.”     |    |
-Classroom is the best way to learn to code | “I want to contribute to open source” | “How effective is Classroom?”  |  |
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+Extensible ecosystem | “I want to integrate Classroom into my existing automated tooling.” |  “I want less manual work when using Classroom with my LMS.” | “I want to find the best exercises for my course.”
+Live feedback | "I want to be able to provide feedback to my students via GitHub.com."| "I want to run my testing suite on student submissions to grade automatically." |