Use simultaneous development in a multicategory claim if payment is possible for at
least one month in the life of the application without the disability determination
(e.g., an aged individual alleges blindness and resides in a State that pays a higher
supplement to blind individuals, or the claimant will attain age 65 before the date
you expect the disability determination to be made). (See SI 00501.300 for definition of a multicategory claim).