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off-by-one error
subject			fact

off-by-one error	has definition A defect in which a program inappropriately adds or subtracts one, or inappropriately loops one too many times or one too few times
	has testing strategy develop boundary tests in which you verify that the program computes the correct numerical answer, or performs the correct number of iterations
	is very common especially in graphical applications
	is a subtopic of 10.3 - Defects in Ordinary Algorithms
	is a kind of defect in an ordinary algorithm
defect	has example the absence of code to handle an exception
problem	has solution which will normally entail developing software, although you may decide that it is better to purchase software or to develop a non-software solution
	should be written as a simple problem statement in one or two sentences