Instruction sheets.
Interesting observation:
I recently helped with a Make-N-Take event; we had many more than 100 kids, most with parent/s. The kit was Revell's '69 Camaro SS; a great snap kit!!
Of all those who participated, there were very few who ran into assembly difficulty ~ a rarity with Make-N-Take events since (usually) about half the participants are first-time builders with very inexperienced parents (vis a vis model building).
But I noticed that every one of the people who ran into trouble or broke parts or couldn't get the 'dang thing' to fit together were people who hadn't even
looked at the instruction sheet.
One particularly snitty woman repeatedly refused our offers of assistance ~ because she knew it all ~ and ended up taking more than three times as long as anyone else while her son quickly lost interest in watching mom put the car together for him ... because she was in a hurry and didn't have time to wait for him to build it. I'd bet he would have had it done in nothing flat! But, mom just insisted on doing it for him in the interest of saving time ... eventually dad showed up and attempted to help ... but he got his head bitten off, too. We all ~ event advisers, the son, and the husband ~ just sat back and watched ... and waited ... and waited ... and all the while, she never consulted the instructions.
The funniest aspect of it all was that the kit has one part that is not used -- a clear headlamp assembly that is required on the exposed headlight Camaro, but this kit uses the RS hidden headlight grille. It was hysterical to watch her try to figure out how to install that part somewhere ... anywhere. Again, she did not look at the instruction sheet (and apparently did not look at the box art), and she would not have any of us offer any advice because she did not have any questions!
PS: I pity the kid ... and his dad.