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The Yoshizawa–Randlett system is a diagramming system used to describe the folds of origami models. Many origami books begin with a description of basic origami techniques which are used to construct the models.

Several standard bases are commonly used as a first step in construction.

Models are typically classified as requiring low, intermediate, or high skill depending on the complexity of the techniques involved in the construction.

The concept of diagramming originated in the 1797 book “Senbazuru Orikata”, the first origami book ever published. The diagrams in this book were very unclear, and often only showed the result of the folding process, leaving the folder unsure of how the model was created.