VA cannot update the VASRD through non-regulatory action. VA could choose to leave the VASRD criteria as is, but failure to update the criteria would result in continued application of outdated medical, scientific, and economic data in the evaluation of disabilities. Applying outdated criteria could render disability evaluations inadequate, inaccurate, and, in some cases, in conflict with current medical and economic understanding of disability. This would result in inadequate assessment of disabilities and lead to reduced efficiency in claims processing and delivery of benefits, as VA could not rely on modern medical records (when available) to quickly assess impairment due to a neurological condition or convulsive disorder. Alternatively, VA could only update the portions of the neurological rating criteria that are most out of date, but this piecemeal approach could lead to the same problems as outlined above for the criteria that would not be updated. This approach would fail to maximize efficiency in claims processing and delivery of benefits.