ISPL, the Information Services Procurement Library, provides a framework based on best practices for the acquisition and management of ongoing services and projects. As an open standard, ISPL mainly focuses on the customer perspective, but provides valuable support for suppliers as well. More and more suppliers are required to make their offers or bids and manage their services based on ISPL.This reference guide presents an overview of ISPL and a reference for those who apply ISPL in their job or in an acquisition process. This guide is not intended to be a course on ISPL or to document ISPL in detail; for these purposes other books on ISPL are more appropriate.This reference guide is based on the `official ISPL products by EXIN:-Introduction to ISPL-Managing Acquisition Processes-Managing Risks and Planning Deliverables-Specifying Deliverables