1. Divide and Conquer Methodology

2. Solve a Complex Problem
Identify a number of simpler problems within the original problem:

3. Modular Programming
The modular programming methodology goes a step further in specifying how the simpler problems should be designed.
Desirable properties:
Each simpler problem can be solved, programmed and 
tested independently from each other.

4. Divide and Conquer
Break a complex problem into: a number of simpler and independent problems we can manage the complexity easier

5. Example
Design Algorithm
Design Classes

6. Information Hiding (1)

7. Information Hiding (2) Direct access:
The variables have public access and they are directly 
accessible (= exposed) to the user.
Indirect access:
The variables have private access and they indirectly 
accessible (= hidden) to the user through public methods

8. Information Hiding (3)

9. Information Hiding (4)
There are 2 aspects in the process of providing information
Implementation = How is the data stored that are used to provide the information.
Functionality = What operations are allowed on the information.
Indirect access technique, makes the 
functionality and implementation  decoupled

10. Information Hiding (5)