Au stringers
observed
before Bond

Contaminated ePolish bath

df

Unsuitable access
to the work place

Lack of planning
for work tasks

It has rained

Unsuitable floor
material

Non-epolished Au seed left on wafers

Person slips

Didn't see the risks

Lack of education
in job safety analysis
(JSA)

Unsuitable shoes

Private cost for
work equipment

Accident

Direct cause

Reson for direct cause

Root cause