Using Becker, a change in inventory method (from Wtd Avg to SL) is a change in accounting principle and the cumulative effects are calculated and handled retrospectively. 

In Wiley, the effect is calculated and handled retrospectively, but Wiley reiterates through 10 mcq that inventory method change does not qualify for cumulative effect any more. 

1)  Does inventory qualify for cumulative effect treatment?  Or is it just retroactively handled?

2)  What is the difference between handled retroactively and qualifying for cumulative effect treatment? 

Thanks for any clarification.

I have to agree with shilpjain.  A change from another method to LIFO is usually handled prospectively because typically companies would have difficulty finding records of the inventory prices for several years ago (since ending inventory under LIFO is based on the prices of goods purchased earlier).  If the company does not have adequate records, they should provide retrospective treatment with cumulative adjustment as far back as records allow. If no records are available, then prospective treatment is acceptable.