Use of software application in this modern computer era is inevitable and it has become the part and parcel of several processes that exists in the world. Computer system consists of hardware and software parts and serve the common man to a researcher in his day to day activities. Various software applications are being developed to cater the needs of endless software or automation requirements. There are rigid requirements in terms of growing down time and failure free operation of software applications. Unreliable and inconsistent software applications results in terms of huge economic losses or risk to human life. Therefore, software reliability is one of the key attribute to be addressed in the software applications to reduce down time and failures. The new model presented in this book is aimed at addressing complete range of software applications. The software reliability determination model shall be used to predict the reliability of full-scale range of the software applications. This model uses the concept of reliability factors, which modifies the actual hazard rate of the software based on its configuration or installation environment.