The CADE ATP System Computer (CASC) evaluates the performance of sound, fully automatic, classical first-order logic, ATP systems. The evaluation is in terms of the number of problems solved, the number of acceptable proofs and models produced, and the average runtime for problems solved, in the context of a bounded number of eligible problems chosen from the TPTP problem library, and a specified time limit for each solution attempt. The 4th IJCAR ATP System Competition (CASC-J4) was held on 13th August 2008. The design of the competition and it's rules, and information regarding the competing systems, are provided in this report.