Each competition year may herald changes from the previous year. These are detailed here.
S4C essentially follows definitions used by the Photographic Society of America (PSA) for its exhibitions, and updates its definitions as PSA's defintiions are modified. S4C, however, restricts or clarifies these definitions where necessary to avoid confusion. Entrants to S4C competitions are advised to read the definitions and other entry requirements carefully to ensure that entered images are in conformance and are not DQed (disqualified).
The following outlines the changes approved by the S4C Board starting with the October, 2018 competition. Entrants are encouraged to read and famliarise themselves with the definitions in detail.