Witnessing privileges are awarded by an admin to user's role in the account. Generally - these roles serve as a high authority for a given area as the people assigned to them give the final signature to an experiment or protocol.

After signing a protocol or an experiment as having been completed, people whose role in the account includes the permission to witness will get a notification to witness it.

In the protocol / experiment, you have the option to witness or reject the signed experiment.

Rejecting the experiment will reject the first signature, and will enable editing the experiment data again.

Witnessing will lock the page permanently. Meaning that there will be no option to revert the signature in the future.

When choosing to reject or witness the experiment, a window will open with a comment section, that will automatically be populated with the person who signed the experiment so he will be notified of the witnessing or rejecting of the experiment.
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Click "Witness" (Or "Reject")
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A window will open with your user name and password, for confirming the Witnessing or rejecting process.
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Click "confirm".
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After witnessing the experiment, a timestamp will appear under the experiment name.
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* When a signature flow is applied to a project, only members who were defined in that flow will have the option to witness all project-related experiments (even if their role does not include the 'Can witness' privilege).