The cost estimation guidelines for the National Special Construction Certification Program were recently revised.

Currently, the only materials used for cost estimation and similar tasks are the following:

"National Association for the Protection of Specific Slopes (Incorporated Association), Rock Bolt Cost Estimation Data (Reference), Fiscal Year H17"

"National Association for the Protection of Specific Slopes: Rock Bolt Cost Estimation Examples (for Reference), Fiscal Year H17"

"Okabe Co., Ltd., Civil Engineering Division: OSDP Rock Bolt Method—Cost Estimation Reference Materials, Fiscal Year H17"

"National Association for the Protection of Specific Slopes: Rock Bolt Cost Estimation Data (Reference) FY H27"

"National Association for the Protection of Specific Slopes: Rock Bolt Cost Estimation Examples (Reference) Fiscal Year H27"