Why: The key dependability issue is make equipment and processes work as advertised, which is, without failure. Dependability aims at facilitating co-operation by all parties concerned (supplier, organization, and customer by fostering an understanding of the dependability needs and value to achieve the overall dependability objectives) so it involves harmonizing conflicting issues. Dependability has a better view point from the end user of the equipment or system than from the designer's viewpoint or the maintainer's viewpoint. From a system effectiveness viewpoint, reliability and maintainability provide system availability and dependability.

When: You cannot repair yourself to happiness with a failure prone system as the failure prone system will be viewed lacking dependability to function as required when you need it. Thus dependability is viewed over the longer term and not in convenient snap-shots and dependability also involves life cycle cost issues.

Where: Reliability contributes directly to uptime by avoiding failures whereas maintainability contributes directly to reducing downtime by faster repairs. Thus reliability and maintainability jointly provide impact on dependability of the system. Dependable systems must be ready to function, in an operable state, to produce the desired output, upon demand by the end user, at the specified quantity and quality of output.

These definitions are written by H. Paul Barringer and are also posted on his web site at www.barringer1.com

Return to Reliability Tools

Upcoming Events

August 9 - August 11 2022

MaximoWorld 2022

View all Events
banner
80% of Reliabilityweb.com newsletter subscribers report finding something used to improve their jobs on a regular basis.
Subscribers get exclusive content. Just released...MRO Best Practices Special Report - a $399 value!
DOWNLOAD NOW
OEE: How Do You Use It?

OEE: How Do You Use It?

Overall equipment effectiveness (OEE) is an often touted tool for managing a manufacturing operation. It is simple in concept, but much more difficult in practice.

The Three Laws of Preventive Maintenance

The Three Laws of Preventive Maintenance

Each preventive maintenance task in an Uptime Elements developed Reliability Strategy is generated for an identifiable and explicit reason

Digital Built America: Smarter, More Sustainable and Resilient

Digital Built America: Smarter, More Sustainable and Resilient

Building back better means transitioning the current infrastructure to smarter, more sustainable forms of development to safeguard the country’s future.