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# Why we calculate MTBF & MTTR ?2

## Why we calculate MTBF & MTTR ?

(OP)
Hi.

I have simple question, why we calculate MTBF & MTTR ?

Regards,

### RE: Why we calculate MTBF & MTTR ?

Why not?  You have something better in mind?

### RE: Why we calculate MTBF & MTTR ?

(OP)
Well, i asked the question because i really don't know why it should be calculated !

I mean, is calculated because it gives an indication of the next expected failure ?!

I simply, don't know :)

### RE: Why we calculate MTBF & MTTR ?

They are measures or estimates of reliability.  A larger MTBF is more reliable.

### RE: Why we calculate MTBF & MTTR ?

(OP)
So, what if the MTBF is small ?
What are the basic steps to correct it ?

Thanks.

### RE: Why we calculate MTBF & MTTR ?

A small MTBF means high failure rate.  So, you either replace the high failure rate components with more reliable ones, or redesign the system to use something else.

This all could have been inferred from the available material and literature on the web.

(OP)
Thanks IRstuff

Now, i got it.

### RE: Why we calculate MTBF & MTTR ?

Abualnassr,

Basically, MTBF and MTTF are aimed at quantifying life statistics for a given product or system.  They are useful for identifying weak links in a design, or for looking at the effects of temperature or electrical stress.  They sometimes are requested (required) by customers.

As mentioned, there are a number of online discussions of these, and other topics in Reliability Engineering.  You have indicated an interest in getting in to reliability engineering.  One of the software vendors who has a lot of good material is:
www.reliasoft.com

I work in a reliability engineering consulting group,
www.opsalacarte.com
(We offer a number of training modules)

Go check out these sites.

Also, join ASQ.org .  They have good materials, and you can get certified (e.g., CRE;  discussed elsewhere in this forum.).

Also, go get a book on reliability engineering.  Here are a couple of suggestions:

Practical Reliability Engineering
Patrick D. T. O'Connor
(a classic;  bit expensive, but very good. Get at Amazon.com)

Halt, Hass, and Hasa Explained: Accelerated Reliability Techniques  by Harry W. McLean
(Get at ASQ.com; cheaper there than Amazon )

==========

Contact me if you would like to discuss further.

John Cooper, CRE
johnc@opsalacarte.com

John Cooper, ASQ CRE
johnfcooper@comcast.net

### RE: Why we calculate MTBF & MTTR ?

(OP)
Thank you John. I really appreciate your help.

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