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+# 1.1.4 Machine Interpretation of a Program
+
+## Session Overview
+
+This lecture introduces the notion of decomposition and abstraction by specification. It also covers Python modules, functions, parameters, and scoping. Finally, it uses the Python assert statement and type 'str'.
+
+## Session Activities
+
+### Lecture Videos
+
+* [Lecture 4: Machine Interpretation of a Program](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00sc-introduction-to-computer-science-and-programming-spring-2011/unit-1/lecture-4-machine-interpretation-of-a-program/) (00:50:18)
+  * **About this Video** - Topics covered: Decomposition, module, function, abstraction, formal parameter, actual parameter, argument, assert, scope, mapping, stack, last in first out, LIFO, strings, slicing.
+  * **Resources**:
+    * [Lecture Code]()
+    * [Lecture code handout (PDF)](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00sc-introduction-to-computer-science-and-programming-spring-2011/unit-1/lecture-4-machine-interpretation-of-a-program/MIT6_00SCS11_lec04.pdf)
+
+## Check Yourself
+
+### What is decomposition?
+
+Decomposition breaks a problem into self-contained, manageable parts.
+
+### What is abstraction?
+
+Abstraction allows us to ignore the details of a piece of code, and use it as a black box - input x, get y.
+
+### What is the difference between formal and actual parameters?
+
+Formal parameters are the names of variables used inside a procedure; actual parameters (or arguments) are the values to those names.