This study aims to develop an Enterprise Systems benefit framework by identifying the benefits accrued by Medium Sized Manufacturing Businesses from the adoption of Enterprise Systems. For this study, Enterprise Systems consist of ERP, CRM and e-Procurement. Through a critical literature review, a conceptual model is proposed which classifies the benefits as cost reduction, time reduction and quality improvement. Through ten case studies the proposed model was enhanced to a framework that groups the benefits as Procurement & Forecasting, Manufacturing & Logistics, Sales, Marketing & Customer Service, IT infrastructure, organisational benefits.