Some instractions are executed in the order in which they are encountered.This processing steps can be combined and represented by one rectange with a single entry point and a single exit poit.

The ability to choose between two alternative courses of action on the basis of whether a condition is true or false.

A way to represent instructions that uses ordinary English; a planning tool for structured programming.

Branch : Transfer control to another part of a program.
Bug     : An error in a computer program.

Programming without the use of branch instructions.