Glossary of Data Variables for Fatal and accident causation ... - ERSO

Manual For SafetyNet accident causation system (SNACS)
The choice between general and specific phenotypes is a question of
information. If enough is known to choose one of the specific phenotypes then
do that, otherwise stick with the general phenotype.
When you have chosen your phenotype, you make a copy of the linking
template (Appendix C) and write down your phenotype of choice in the box
which says phenotype.
6.7.4 The linking from different genotypes to the phenotype
Now it is time to start linking the contributing factors or genotypes to the
phenotype that has been chosen. To do the linking you need the linking tables
that are part of Appendix B.
Now remember from the example of Kalle above that what you want to do with
the linking system is to systematically describe how all the known contributing
factors brought the phenotype, and hence the accident, about. For example, if
you know that windshield glare, a screaming child in the vehicle and the design
of the traffic environment were all contributing factors, you need to do a
separate linking analysis for each of these factors. Due to the construction of
the linking system, on paper some of the chains may share intermediate links.
Mentally however, you need to keep the chains separate and register each
chain separately into the database.
When you do your first linking to the phenotype, you stay with the table called
PHENOTYPES which you used for phenotype selection (example above). In its
leftmost column are all possible genotypes for the phenotypes listed. Find the
row where the phenotype you choose is listed, and look through the list of
genotypes that are written on the same row.
Of the available genotypes you choose the ones that fit in with the accident
description. Keep your CPC evaluation and accident data at hand, so you easily
can check circumstances or facts you are unsure of. When you have decided
on one or more genotypes, you write these down in the genotype boxes closest
to the phenotype box on your copy of the linking template.
6.7.5 The linking from genotype to genotype
This step is repeated for each of the genotypes chosen until the analysis is
complete, i.e. one of the four stop rule criteria is fulfilled.
Start with a genotype in the linking template which has no filled in links to the
left, and which is not marked as an end point. Locate its linking table (this is the
table where the genotype is found as a general consequent) in Appendix B by
looking at the letter next to the genotype, and locating the table which has the
same letter in its heading. In this table, find the row where that genotype is
listed as a general consequent in the rightmost column. In the example below,
we have located the table for the genotype “Observation missed (B1)” which is
called “Observation (B)”.
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