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control coupling
subject			fact

control coupling	can be reduced by having the callers of the routine directly call the methods called in the second routine the use of polymorphic operations using a look-up table that maps a command to a method that should be called when that command is issued
	has definition A form of coupling in which one component affects the sequence of execution in another
	has example public routineX(String command) { //routineX will have to change whenever any of its callers adds a new command if (command.equals("drawCircle") { drawCircle(); } else { drawRectangle(); } }
	is a subtopic of 9.2 - Principles Leading to Good Design
	is named after common blocks in the Fortran language which are used to hold global variables
	is a kind of coupling
	occurs when one procedure calls another using a 'flag' or 'command' that explicitly controls what the second procedure does
coupling	implies that if you want to reuse one component, you will also have to import all the ones with which it is coupled
software quality	is hard to assess