Hi Anya,

Welcome to the IFSQN forums
I’m not sure you need a decision tree, you need to assess the risk of glass/brittle material contamination and take appropriate action including putting monitoring in place.
Risk Matrix Glass Contamination.png 91.16KB
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Physical contamination controls should be considered by assessing the risk, then either eliminating, preventing or detecting.
Eliminating: Where possible, eliminate the hazard - remove unnecessary glass
Prevent: Use control procedures to prevent the risk – protect glass items from breakage or apply film & monitor
So, items deemed high risk should ideally be removed, if not they should be protected in some way and monitored at an appropriate frequency. For example a glass gauge on a filling machine with open product should be removed if unnecessary. If it is needed then a film should be applied to limit any spread of glass if there is a breakage and it should be frequently check, say at the start and end of each shift. This can be achieved by having a simple check on the daily production record.
Kind regards,
Tony