Provide some definitions for assignment 1

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@@ -17,8 +17,28 @@ Answer the following questions (250 words max/question).
 > "The separation of data descriptions from the application programs that use the data."
 
 * Briefly contrast and compare the following development approaches: the systems development life cycle and the prototyping methodology.
+
+The `systemd development life cycle` is a set of steps that include the following phases:
+
+* planning: gain understanding of the problem to solve and the benefit of solving the problem.
+* analysis: analyze the problem thoroughly to determine requirements.
+* design: write specs for the possible solution.
+* implementation: write software to solve problem.
+* maintenance: repair, enhance and monitor system.
+
+The `prototyping methodology` is an iterative process that allows realizing value sooner.
+
+1. identify problem
+1. design prototype
+1. implement prototype
+  * iterate on prototype
+1. push to production and release to users.
+
 * Discuss the difference between entity type and entity instance.
 
+An `entity type` is a description of the data the describes the common attributes for data in a collection. i.e. the table definition.
+An `entity instance` is a specific occurrence of the `entity type`. .i.e. a specific row in a table.
+
 ### Question 2 (15 marks)
 
 Give a simple example of an E-R diagram for each of the following concepts: