Premise: This analysis was revised when it was determined that the interim program, which began on January 1, 1995, would last 30 months rather than 18 months and there were changes in the estimated cost of deposit control testing and the addition, in the final rule, of a required deposit demonstration test to qualify test fuels for certification testing purposes.

Hypothesis: The interim program's length changed due to unpredictable factors out of their control.
Relation: neutral