The Concept of bugs’ infusion has been a very prominent area of research concerning Software Reliability Growth Modeling. The literature is evidence of some very useful proposals concerning this domain in terms of dealing with these issues based on error generation. However, whenever this topic is touched, researchers have considered a constant rate of error generation. In this work, authors have utilized two forms of bug infusions in the code. Furthermore, by using an MCDM technique of MAUT, the release time of the software under consideration has been determined. Results provide a satisfactory orientation for using the proposed models based on the infusion of bugs/errors and obtaining optimal release time.