One problem, five different torches
The college Wi-Fi is down. Why? You can ask it in five ways. Start at the failure and work back to causes. Ask what else stops working. Look at each part and how it breaks.
Each way finds something the others miss. Today you meet five tools for looking at a risk.
By the end of this lesson
Note
I can name five tools for analysing a risk and say what each one is for.
Key words
| Word | What it means |
|---|---|
| Fault tree | a diagram that starts at a failure and branches down to its causes |
| Impact analysis | a list of what is harmed if something fails, and for how long |
| FMECA | failure mode, effects and criticality analysis: a table of how each part can fail and how serious it is |
| CRAMM | a UK government method with three stages for finding and treating risk |
| SWOT | strengths, weaknesses, opportunities and threats |
| Component | one part of a system, such as a switch or a disk |
The cells students fill in are left blank in this preview.
Starter
Have a go
Starter
3 questionsYour answers are marked here and are not kept. A college account keeps every student’s marks.
Fault tree analysis
A fault tree starts at the top with the failure you fear. Under it you draw the causes.
Two joins matter. An OR join means any one cause is enough. An AND join means all causes must happen together.
Check: read the fault tree
Have a go
Check: read the fault tree
3 questionsYour answers are marked here and are not kept. A college account keeps every student’s marks.