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No doubt, more than three attributes make up effective icon design, but the three elaborated below are a good place to start. For the sake of relative brevity, we have focused on what we consider to be the three main attributes.

Icons that are well designed exhibit a methodical and deliberate approach to the three major attributes that make up any icon design: form, aesthetic unity and recognition. When designing a new icon set, consider each of these attributes in an iterative approach, starting with the general (form) and proceeding to the specific (recognizability). Even if you’re creating a single icon, these three attributes are still implied and can be extrapolated from a single design.

Form is the underlying structure of an icon, or how it is made. If you ignore the details of an icon and draw a line around the major shapes, do they form a square, a circle, a horizontal or vertical rectangle, a triangle or a more organic shape.