This repository originally comes from Stanford University, and is now maintained by Harvard. It holds problem types for edX, for use as Custom JavaScript Display and Grading problems.

• "Accessible Matching": A standard matching-type problem as seen in a myriad of classroom quizzes. Designed to be usable on screen readers as well as by sighted users.
• "Card Sorting": A card-sorting exercise. Used to in cognitive science to measure expertise in a particular field.
• "Celluar Automata": Full-featured JS Input project demonstrating a cellular automata problem.
• "Drop File": A bare-bones problem that uses Javascript to check a file and see whether it's an image or text. Constructed as an example of how someone might create a file-processing problem.
• "Journaling" - Rich text editor that saves to the Learner Backpack (below) and gives credit for entering text. Uses HX-JS.
• "Learner Backpack": Creates storage for student-associated data in edX. Meant to be used with HX-JS, but adaptable for other purposes.
• "Mirror": Simple 'Hello World' project that works well as a barebones starter.
• "Mufi Text Editor": Simple, lightweight rich text editor. Grades on participation.
• "Piano": More complicated project that demonstrates more advanced use of JS Input
• "Qualtrics Grader": Allows grading of Qualtrics surveys based on percent completion.
• "Range Guesser": Allows students to guess at a number (or time) by setting a range. Closer guess = more credit.
• "Text Logging Problem": Gives students credit for entering free-response text, and logs it.
• "Variable Passing": How to get numbers or text generated by the problem's Python code into your internal Javascript. Also, how to log your results in the official edX logs.
• "Video Watch Credit": Gives students credit for watching a video, or for just having it play while they go make a sandwich.

• "Matching": A standard matching-type problem as seen in a myriad of classroom quizzes. Replaced by the Accessible Matching problem.
• "Adaptive MC": Creates a set of resources where the path depends on a student's answers to MC questions. Still under construction.