A theory of sets (or why you will only really know 12-15 gaming books at a time)

jester47

First Post
I was reading the tipping point and one section of it has hit me as really important. Apparently there is a lot of research that says that human beings can only keep track of 150 relationships. If you were to count the people that you considered close friends you would not go over 15 and most people sit at 12. This is because keeping track of 12 friends and how they relate to each other yeilds 154 things you are keeping track of. (12+144 is 154). Also, the number of aquaintences that you keep track of are also about 150.

This got me thinking. Most bands never play more than 12 songs in a set. Back in my DJ days, I only really paid attention to about 12 tracks at a time. When you mix records, you need to keep track of how each track relates to all the others.

So then I realised, the same thing is true for D&D books. When you get a new gaming book, you need to keep track of how the new informaiton relates to all of those books. Since the books don't relate to you, I wold suspect that you could handle about 13-16 books. After that stuff starts to gather on the shelf and I would suspect that the frequncy of use per book would start to drop off drasticly.

Indeed it seemed that somewhere between The Mannual of the Planes and the Epic Level Sourcebook things seemed to get unweildy. Doing a quick look at the online catalog, it shows that between that time the number of supplements for just the core game reached 12+ If you were using FR stuff, the number of supplements contianing new rules passed that just before the arrival of the Manual of the Planes. And it was around this time people started to complain that there were too many feats and PrCs.

So in my own collection I see the rule of 12. I am starting to think I have too much 3.x realms info and that to expect to even think of using it all together wold be silly. I regularly only really keep in mind 12 books. Much more than that and I find that stop using a book enough to merit its cost.

It seems that developmentaly game designers have the same problem. They start to loose track of how the books in a line relate to other books. Looking at 1st ed, there were not more than 15 hardcover books. This tells me that perhaps, the only way to maximise enjoyment of D&D is to limit your rules expanding books to a range of 12-15 books in a session or campaign.

I find this interesing. What is your experience?
 
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I'll buy this.

Though other solutions are to give the books to a library or charity service. Or buy PDFs. Or buy lots of books anyway so you can impress the ladies.
 

I have upwards of thirty d20 books and at least twice that many for various other systems. While I certainly don't use every book for a given system every time I play, GM, or write an article/adventure/game book, I have at one time or another used every single one - even the 3.0 Deities & Demigods! I have at least thirty issues of d20 magazines - ENWorld, Signs & Portents, Dragon and Dungeon, mostly - to cull material from. I've also borrowed or looked at at the table dozens of d20 books belonging to other players or GMs.

While I couldn't quote rules from any of them on the fly (except SilCore and perhaps d20 Modern) I've never had a problem remembering enough to use them.
 

At once, I presume.

I think I have more than that many sitting by the side of my bed to do campaign prep.

You start to talk about how many went into my entire campaign, that really ratchets up.

I think the real practical limiter is time. I typically only game 4 hours. Assuming 1 encounter per hour, that means 1 NPC or other encounters. I'd typically only use 2 or 3 products on a single creature, but some detailed NPCs go deeper than that. A complex encounter might involve multiple different creatures.

Check out the "what books did you use last session" thread to get an idea of how many books people are really using:
http://www.enworld.org/showthread.php?t=83279
 

It depends how you define "use". I'm setting up for a new campaign that doesn't start for 10 more days and I've already referenced 2 dozen books for it with more that will be referenced in the coming week and a half.
 

Well, I must be an outlier then, because I have well over 300 d20 supplements, and while I certainly don't use every rule from every book, I have used pieces and parts of a lot of them at some point during the last 6 years of 3.x gameplay.

And I can fairly quickly remember which book which obscure rule came from.
 

Correct me if I'm wrong, jes, but I don't think you're saying that people can only USE 12 - 15 books. I think you're saying that most people can only manage 12 - 15 books' worth of material in their heads at any one time. Of course, you might be able to "swap" out books and expand your possibilities that way, but if you are, for example, reading through the Complete Divine, there's a limit to how many other books you'd be able to easily imagine having connections to what you're reading.

I'd buy that, with the caveat that those 12 - 15 shift over time. It's not really an argument for NOT buying books, but it IS an argument for reading over the books that will most powerfully reward your connection-building efforts.
 

barsoomcore said:
Correct me if I'm wrong, jes, but I don't think you're saying that people can only USE 12 - 15 books. I think you're saying that most people can only manage 12 - 15 books' worth of material in their heads at any one time. Of course, you might be able to "swap" out books and expand your possibilities that way, but if you are, for example, reading through the Complete Divine, there's a limit to how many other books you'd be able to easily imagine having connections to what you're reading.

I'd buy that, with the caveat that those 12 - 15 shift over time. It's not really an argument for NOT buying books, but it IS an argument for reading over the books that will most powerfully reward your connection-building efforts.

You have the right it BC. That is exactly what I mean.
 


So you could keep track of more material if they were bound in thicker books?

For example, suppose you only have the monster manual in your set of 12 books; the monster manual II and III are too much to keep track of. If an omnibus version (monster manual I, II and III) came out, you could buy it and it suddenly be possible to keep track of all the material?

Or you just have enough room for either the Book of Vile Darkness *or* the Book of Exalted Deeds. If they bound them together (the "Book of Extremes") then you could have both?

This sounds fishy to me.
 

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