TO assess sight word spelling: Test of Written Spelling (3rd
edition, NOT 4th) 'unpredictable words subtest' (Larsen &
Hammill, 1994) TO assess rule knowledge: 'nonword spelling subtest'
from the Queensland University Inventory of Literacy (QUIL: Dodd et
al., 1996). Or, Sacre & Masterson's (2000) Single Word Spelling
Test (NFer Nelson) is excellent, too.