The lifefimes of the (2p)2
P
3/2 level in Si XII and the (2p
2)3
P
2,1,0, (2s2p)1
P
1 and the (2p
2)1
D
2 levels in Si XI have been determined using the beam-foil method. It is proposed that existing discrepancies between experimental and theoretical f values for the (2s
2)1
S
0-(2s2p)1
P
1 transition in some ions of the Be sequence may be the result of the inability of the experimentalist to account for strong cascading from the (2p
2)1
S
0 level.
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