Purpose: One of the challenges in social casework is the measurement of its effectiveness, and the challenge mainly arises due to the lack of a standardized tool. The present research is aimed at filling that gap through the development of a scientific scale to measure the effectiveness of casework practice. Method: Data were collected from 202 former casework clients across 22 organizations in India. The collected data were then used to carry out both exploratory and confirmatory factor analyses, Discussion: The 10-item casework effectiveness scale (CES-10) has been found to be highly valid and reliable (Cronbach alpha: .956). Across multiple types of validity and reliability indicators. Apart from making a wide range of studies possible, the tool also opens the door to future randomized controlled trials, to help test and build scientific evidence for social casework practice. CES-10 is now publicly available and free to use.