You are working for Mindak LLP, an accounting consulting firm, as a research and accounting specialist. Rowling Inc., an important manufacturing client, has asked you to research and explain the accounting rules for property, plant and equipment issues that the company is experiencing. The client wants you to reference and briefly explain the GAAP rules provided in the FASB codification. Rowling Inc. will then use your business professional memo to look up the rules in the codification.

(a) the capitalization period for interest being capitalized on self-constructed assets,

(b) impairment of property, plant and equipment,

(c) changes in the estimate of depreciation useful life or salvage value,

(d) the primary disclosures that need to be made for property, plant and equipment.