Project Portfolio Management (PPM) is a term used by project managers and project management (PM) organizations to describe methods for analyzing and collectively managing a group of current or proposed projects based on numerous key characteristics. The fundamental objective of the PPM process is to determine the optimal mix and sequencing of proposed projects to best achieve the organization's overall goals - typically expressed in terms of hard economic measures, business strategy goals, or technical strategy goals - while honoring constraints imposed by management or external real-world factors. Typical attributes of projects being analyzed in a PPM process include each project's total expected cost, consumption of scarce resources (human or otherwise) expected timeline and schedule of investment, expected nature, magnitude and timing of benefits to be realized, and relationship or inter-dependencies with other projects in the portfolio.
(Source: http://en.wikipedia.org/wiki/Project_Portfolio_Management)

Manufacturing Process Management (MPM) is a collection of technology and methods used in the manufacturing and ERP/MRP defines when it is to be made; MPM defines how it will be made.
(Source: http://en.wikipedia.org/wiki/Manufacturing_Process_Management)
Document Management System (DMS) is a computer system (or set of computer programs) used to track and store electronic documents and/or images of paper documents.
(Source: http://en.wikipedia.org/wiki/EDMS)

Bill of Materials (BOM) is the term used to describe the parts, components, and raw materials needed to produce a saleable end-item.
(Source: http://en.wikipedia.org/wiki/Bill_of_materials)