PRISM Forum - Message Replies
Topic: PRISM Questions and Answers
Topic Posted by: SRC
Date Posted: Wed Jan 12 8:33:33 US/Eastern 2000
Topic Description: Welcome to the PRISM forum! Please feel free to post your questions and comments about the PRISM assessment software here.
Posted by: Tom Brennom
Date posted: Tue Feb 28 9:12:29 US/Eastern 2006
Subject: Component Model Failure Rates
Can you tell me how often component model base failure rates are updated? I realize that publications such as EPRD-97 and NPRD-95 document component failure rates. But, how often are those of PRISM updated? One of the old challenges of -217 was always trying to keep up with the changing IC technologies and failure rates.
Subject: PRISM Updates
Reply Posted by: bwd
Date Posted: Tue Feb 28 10:25:09 US/Eastern 2006
The electronic and non-electronic databases, EPRD, NPRD, FMD and VZAP are being replaced by our new product, SPIDR. This product is the collection of the latest part failure and failure mode data for electronic and non electronic components. These data are being used in an update of our PRISM program which is being performed now. The update includes revision of current model data and construction of new models for components not included in PRISM. The plan is to continuously add information to the SPIDR database as information is collected. This information will then be used to update the PRISM database in a timely manner. MIL-HDBK-217 was updated every 2 to 5 years as information on parts was collected and models were reconstructed. The PRISM process does not require model reconstruction, only the addition of new data, so updates will be more frequent.