In SCORM 2004 defines the sequencing information that describes how SCORM-conformant content may be sequenced to the learner through a set of learner or system-initiated navigation events. It provides users the ability to prescribe the intend learning sequencing strategy by themselves, but quit many completed definitions and lacking the testing mechanism for these authored sequencing information results in usual developers probably design the unreasonable or careless settings of SCORM sequencing. The detecting mechanism focuses on detecting improper setting of sequencing control mode elements applied to learning activities. An assistant truth table derived from the definitions of sequencing control mode elements and experiments verified with latest ADL runtime environment will be introduced.