Updated README

README.md

@@ -9,3 +9,41 @@ Usage:
 
        <Concept server="http://www.sample-concept-demo-server.org:7000/">
 
+This displays: 
+
+![ConceptXBlock screenshot](learning_objectives.png)
+
+In the bottom left, you can search for learning objectives, and drag
+them into one of the top three bins. The bins are: 
+
+* Taught: For concepts which the item introduces. For example, a video
+  explaining the quadaratic equation would be tagged as teach the
+  quadratic equation. Perhaps should be renamed to 'introduced'? 
+* Exercised: For concepts which the problem is explicitly designed to
+  practice. For example, "Solve 5x^2+6x=7" would exercise the
+  quadratic equation.
+* Required: For concepts implicitly required. For example, a physics
+  problem on the path of a rocket might have the quadratic equation
+  as a prerequisite, but not be explictly designed to exercise it. 
+
+The edit button is a link back to the concept tag server, where we can
+edit concept descriptions.
+
+The system has a few serious issues: 
+
+1. Performance. This is trivial to fix, but the system currently makes
+   an AJAX request per objective on the page. Bulk requests would
+   solve this.
+2. 500 errors when e.g. a concept is not on the concept server. 
+3. No test cases. 
+4. Shown as a student (rather than instructor) view. This is a Studio
+   limitation. 
+5. Lack of configurability. It works on my taxonomy
+   (taught/exercised/required), and not yours.
+
+It does have a few nice properties: 
+
+1. Continues to develop edX-as-a-platform, rather than
+   edX-as-a-product.
+2. Natural path (via concept wiki) to coming up with a concept
+   taxonomy. Next steps will be to split and join objectives.
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