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* Difficulty : <math>D = { \eta_1 \over 2 } \times { N_2 \over \eta_2 } </math>
* Effort: <math>E = D \times V </math>
The difficulty measure is related to the difficulty of the program to write or understand, e.g. when doing [[code review]].
The effort measure translates into actual coding time using the following relation,
*Number of delivered bugs :
B = ( E ^ (2/3) ) / 3000 or more recently, Volume / 3000 is accepted.
Halstead's delivered bugs (B) is an estimate for the number of errors in the implementation.
* Time required to program: <math>T = E/18\,</math> seconds
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