"Engineering, Procurement, and Construction" (E P C) is a particular form of contracting arrangement used in some industries where the E P C Contractor is made responsible for all the activities from design, procurement, construction, to commissioning and handover of the project to the End-User or Owner.

This form of contract is covered by the FIDIC Silver Book containing the title words EPC/Turnkey. Other abbreviations used for this type of contract are LSTK for Lump Sum Turn Key, EPIC for Engineering, Procurement, Installation & Commissioning, and sometimes also "EPCC" which is short for "Engineering, Procurement, Construction and Commissioning".

Use of EPC is common e.g. by FIDIC and most Persian Gulf countries. Use of LSTK is common in Kingdom of Saudi Arabia. Use of EPCC is common in Qatar and some other countries e.g. by Qatar Petroleum. Therefore, an EPC, LSTK or EPCC are all same types of contracts a typical well-known example of which is the Silver Book of FIDIC.

"Engineering, Procurement, and Construction Management" (EPCM) is a special form of contracting arrangement. In an EPCM arrangement, the client selects a contractor who provides management services for the whole project on behalf of the client. The EPCM contractor coordinates all design, procurement and construction work and ensures that the whole project is completed as required and in time. The EPCM contractor may or may not undertake actual site work.

Difference between EPC and EPCM are clarified by the following statement by Jonathan Hosie in the cited paper:

"The acronym EPCM is also encountered frequently on international projects, but this is very different from EPC. EPCM is a services-only contract, under which the contractor performs engineering, procurement, and construction management services.