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Abstract: The parameters governing the accessibility of functional groups in catalysts or organic reagents supported on polymer resins are discussed. They include the microenvironment contribution of the polymer chain, the viscosity and crosslink density inside the gel or microgel particles, as well as thermodynamic compatibility of the reaction medium with the polymer structure. They also include the texture of a porous resin which is fully described by the synthesis process that may be used, as well as the methods already used to obtain the pore size distribution in the swollen state. Some recent directions worked out in order to improve the accessibility are described and all the discussions are illustrated by a few selected examples.