---
title: "SIF Design Tab Layout"
slug: "design-tab-1"
updated: 2026-10-27T23:12:24Z
published: 2026-10-27T23:12:24Z
canonical: "ims-handbook.cenosco.com/design-tab-1"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://ims-handbook.cenosco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# SIF Design Tab Layout

![](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/image-1709662827054.png?sv=2026-02-06&spr=https&st=2026-10-28T15%3A08%3A03Z&se=2026-10-28T16%3A08%3A03Z&sr=c&sp=r&sig=fYApqmSfO8vFj86H2w4%2BGFHlWthx%2Fpa4FZgyU3pWsUg%3D)This tab is used to do the SIF Design. The aim is to design the Subsystems in terms of their Equipment Actuators and Test Intervals, such that the 90% upper limit of the Achieved PFD is less than the Target PFD, while ensuring that the Success Criteria, Fault Tolerance, and Performance are all OK.

[The SIF Analysis Steps](/v414/docs/the-sif-analysis-steps) should be followed during the design.

The SIF Analysis design tab has three areas:

1. SIF Analysis Details
2. Subsystem Details
3. Approval Area.

The SIF Analysis Details repeat what is also shown on the Details section of the ![Icon Description automatically generated](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/sf-design-tab---layout-image-6g05ckn9.png?sv=2026-02-06&spr=https&st=2026-10-28T15%3A08%3A03Z&se=2026-10-28T16%3A08%3A03Z&sr=c&sp=r&sig=fYApqmSfO8vFj86H2w4%2BGFHlWthx%2Fpa4FZgyU3pWsUg%3D)[General tab](/v414/docs/general-tab). You can collapse this area to create more space.

The Subsystems Details is where most of the design takes place. This is where you can further define your [Subsystems](/v414/docs/defining-sif-subsystems), define [Success Criteria](/v414/docs/defining-sif-success-criteria), and verify [Fault Tolerance](/v414/docs/verifying-sif-design-dangerous-fault-tolerance-requirements) and [Performance](/v414/docs/verifying-sif-performance).

The Approval area is used verify the [Achieved PFD](/v414/docs/calculate-sif-pfd-and-verifying-integrity) and [Response time](/v414/docs/verifying-sif-response-time). To finally [Approve](/v414/docs/approving-the-sif-design) the design, click the Approve button to open the Approval pane.

![](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/pic%201-6LZUMQFR.png?sv=2026-02-06&spr=https&st=2026-10-28T15%3A08%3A03Z&se=2026-10-28T16%3A08%3A03Z&sr=c&sp=r&sig=fYApqmSfO8vFj86H2w4%2BGFHlWthx%2Fpa4FZgyU3pWsUg%3D)The Design tab layout.