A race condition in a workflow representation is detected and corrected. The present invention also relates to kits to perform such methods. An image sensor may include image pixels that receive light and dark pixels that are prevented from receiving light. A confidential version of the message is made available only to a specific subset of the participants in the forum; a public version of the message, obtained substituting the replacement information for the corresponding confidential portions of the original text, is made available to all the other participants.