operational excellence management system

In 2004, we launched our Operational Excellence Management System (OEMS), a comprehensive system that helped build our OE culture and improve our health, environment and safety performance. We updated our OEMS in 2018 to emphasize more visible linkages between risk, assurance and safeguards and a streamlined approach to manage risk. These updates help improve our focus on preventing high-consequence incidents and impacts.

safeguards are at the heart of OEMS

leadership and OE culture

Through the OEMS, our leaders engage employees and contractors to build and sustain our OE culture and deliver OE performance.

focus areas and OE expectations

Focus areas align with critical OE risks and include:

  • Workforce safety and health
  • Process safety, reliability and integrity
  • Environment
  • Efficiency
  • Security
  • Stakeholders

The OE expectations guide us to design, manage and assure the presence and effectiveness of safeguards.

management system cycle

Through application of the Management System Cycle, our leaders make risk-based and data-driven decisions, prioritize activities, and direct improvements.

risk management

OEMS is a risk-based and systematic approach to identify, assess, prioritize and manage OE risks.


We establish and sustain safeguards and assure they are in place and functioning in accordance with legal and OE requirements.

Safeguards are the hardware and human actions designed to directly prevent or mitigate an incident or impact. Typical safeguards include facility designs, mechanical devices, engineered systems, protective equipment and execution of procedures.


Through the execution of assurance programs, we have confidence the safeguards are in place and functioning.

certification of the OEMS against ISO standards

Since 2004, Chevron has engaged an accredited assurance provider, Lloyd’s Register Quality Assurance, Inc. (LRQA), to verify that our Operational Excellence Management System (OEMS) meets international environmental and safety management system standards and specifications.

The Certificate of Approval demonstrates the alignment of our OEMS with ISO 14001:2015 and 45001:2018 standards, as well as the integrity and strength of our Chevron Technical Center in setting the strategic direction of the OEMS and providing oversight and verification of its effectiveness throughout the corporation.