Features of top-down technique

Program preparation is stretched to a number of levels
In place of writing long list of statements, the statements are separated into different modules at various levels.
The stretching is most general to most specific.
Program is structured as hierarchy of various tasks.
As the techniques moves from top to bottom, it is a type of specialization.
Main module can be designed well before without requiring details of complete design.
Testing can be done after inserting down level modules one-by-one.
Parallel development is possible because of top and down level modules design.