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Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

No

Yes

Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

No

Yes

Does the problem

occur on a red route?

No

Yes

Is the problem

persistent?

No

Yes

Is the problem

difficult to overcome?

No

Yes

Does the problem

occur on a red route?

No

Yes

Is the problem

persistent?

No

Yes

Medium

Serious

Is the problem

difficult to overcome?

No

Yes

Does the problem

occur on a red route?

No

Yes

Is the problem

persistent?

No

Yes

Medium

Serious

Is the problem

difficult to overcome?

No

Yes

Does the problem

occur on a red route?

No

Yes

No

Is the problem

persistent?

Yes

No

Is the problem

difficult to overcome?

No

Yes

Does the problem

occur on a red route?

No

Yes

No

Is the problem

persistent?

Yes

No

Low

Medium

Is the problem

difficult to overcome?

No

Yes

Does the problem

occur on a red route?

No

Yes

No

Is the problem

persistent?

Yes

No

Low

Medium

Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

No

Yes

Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

Is the problem

persistent?

No

Yes

No

Yes

Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

Is the problem

persistent?

No

Yes

No

Yes

Medium

Serious

Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

Is the problem

persistent?

No

Yes

No

Yes

Medium

Serious

Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

No

Yes

Is the problem

persistent?

No

Yes

Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

No

Yes

Is the problem

persistent?

No

Yes

Critical

Serious

Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

No

Yes

Is the problem

persistent?

No

Yes

Serious

Critical

Does the problem

occur on a red route?

No

Yes

Is the problem

difficult to overcome?

No

Yes

Is the problem

persistent?

No

Yes

Does the problem

occur on a red route?

Yes

Is the problem

difficult to overcome?

No

Yes

Is the problem

difficult to overcome?

No

Yes

Yes

No

Low

Medium

Serious

Critical

Is the problem

persistent?

Yes

Is the problem

persistent?

No

Yes

Is the problem

persistent?

No

Yes

No