The researcher has systematically adapted the existing VLS inventory
proposed by the previous researchers both in other countries and in the Thai context. The new inventory has been used as the main instrument to obtain the VLS employed by the tertiary-level students in Northeast of Thailand. The reliability estimate of this inventory is considerably higher than the acceptable reliability coefficient of .70 which is the rule of thumb for research purpose. This inventory maybe useful for further research on VLS in other contexts in Thailand.