Canliss Milling Company purchased machinery on January 2, 2009, for $800,000. A five-year life was estimated and no residual value was anticipated. Canliss decided to use the straight-line depreciation method and recorded $160,000 in depreciation in 2009 and 2010. Early in 2011, the company revised the total estimated life of the machinery to eight years.

Required:
1. What type of accounting change is this?
2. Briefly describe the accounting treatment for this change.
3. Determine depreciation for 2011.