This document summarizes a study on startups and clients perspectives on the performance of technology business incubators. The study aimed to identify key drivers and inhibitors of incubator performance from the perspective of startups and clients, who graduate from incubators, as most previous research focused only on the incubators. Statistical analysis of survey responses from incubator managers identified 11 dimensions of incubator performance. Analysis found that factors like program management, entrepreneurial support, graduation policies and client selection were key drivers of performance, while financial support factors were key inhibitors. The study concluded these dimensions provide insights into improving incubator effectiveness from the startup and client point of view.