In some instances when the use of a garden tiller would be ideal, it cannot be done. The reason is that some patches of land are very small or cannot be accessed, so there is no way to get a large motor operated machine in the area to break up the soil. In these instances a garden fork is called upon to do all of the work that a tiller often does in modern day gardening.
Different-Sizes-and-Uses-of-a-Garden-Fork.html