RecipeResearch
I've always been inspired by Thaumcraft's approach to studying various spells and recipes, but I decided to go several steps further and apply this concept to ALL in-game recipes. The result is a mod that fundamentally changes the approach to crafting in Minecraft.
Now instead of magically knowing all recipes from the very beginning, your character must practice and study them to avoid mistakes when creating items. In the early stages this isn't a big problem, but when ingredients become expensive and machinery part requirements become more complex, the situation becomes very interesting (and quite frustrating if random numbers aren't on your side).
This is an excellent addition for hardcore modpacks where it's necessary to slow down experienced players' progress... or if you simply enjoy creating additional challenges for others. The mod includes several settings that allow you to adjust its difficulty level.

Compatibility Features
The mod only affects recipes created through the standard crafting grid (or its derivatives). Some mods may change the way recipes are created and thereby neutralize this mod's effects. I'm currently working on a solution to this problem.
Recipe Research in Action
You'll have to experiment with various item combinations and study creation methods through practice. Each successful crafting attempt brings you closer to fully mastering the recipe.
