Paper, PWASET Volume 26, 2007, ISSN 1307-6884, 720-725 c.
The Moranda’s Geometric de-Eutrophication model alleviates some of the objections to the Jelinski Moranda model for software failures. In Moranda Geometric de-Eutrophication model,
N(t) is defined as the number of faults detected in the time interval (0, t]. In this paper, N(t) is studied as a pure birth stochastic process, where failure rates decrease geometrically with a detection and fixing of a fault. This paper demonstrates the use of a recursive scheme to
study the probability of detecting ' n' number of bugs in time (0, t].
The method uses a constructed table which makes this method more easier compared to all the other existing methods to compute the Probability of removal of n number of faults in time (0,t] i.e. Pn (t), intensity function λ(t), and Probability that the software does not fail in the interval (t, t +t ] i.e. (t). In the proposed procedure Pn (t) involves (n +1) terms and each term is multiplied by a constant, obtained from the constructed table. The developed system performs with 90% accuracy as compared to earlier system and approximately 10% reduction in time for projects with
size (delivered object code instructions) in the range of 5000-21000 and the tabular and the recursive technique has made the system simple to understand.