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@@ -509,5 +509,12 @@ the rate of growth in determining computational efficiency for large inputs.
 
     Reduce the input size by rejecting elements or hard code an early return if some condition is satisfied.
 
+    Check for some particular input and if it receives that then returns some
+    answer. i.e. cheating. Slow algorithm that works fast on some input.
 
-## 2.3 Designing Algorithms
+[Watch](http://freevideolectures.com/Course/1941/Introduction-to-Algorithms/1)
+
+* Performance
+* User friendliness
+
+Algorithms give you a language to talk about language behaviour.