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Message: <blockquote data-quote="Celebrim" data-source="post: 8720516" data-attributes="member: 4937">I don't know that we did.You introduced the topic by saying, ""I make a perception check" is not a valid action declaration in any version of D&D."This actually is talking about the topic of proposition filters.  Proposition filters are a process of play whereby the GM decides whether to treat a player's action declaration as a valid proposition to adjudicate.  Proposition filters are usually poorly discussed in most RPGs, and especially in older RPGs, and even when they are discussed the implications of the rules may be overlooked because most games tend to start before all the rules have been read much less read and understood.  Therefore, most tables end up making up their own set of processes of play to determine whether or not to validate a proposition.   It turns out that proposition filter procedures of play get really complicated.  Probably the procedures of play at most tables are so complicated that they'd need pages and pages of rules to describe them, and yet they are so ubiquitous to play that most tables don't even realize they exist or think about them.A lot of the wider ranging discussion is about proposition filters generally, which is I think still on topic for your specific example.</blockquote>