A case study was conducted to measure the acoustical properties of a church auditorium. While modeling the project using EASE 2.1, some problems arose when attempting to determine the reverberation time using the Schroder Back Integrated Impulse Function within EASE 2.1. An auxiliary investigation was launched aiming to better understand the Schroeder algorithm in order to produce a potentially improved version in MATLAB. It was then theorized that the use of a single linear regression is not sufficient to understand the nature of the decay, due to the non-linearity of the curve, particularly during the initial decay. Rather, it is hypothesized that the use of numerical methods to find instantaneous rates of change over the entire initial decay along with a Savitsky-Golay Filter could possibly yield much more robust, accurate results when attempting to derive the local reverberation time from reflectogram data.