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standards of speech intelligibilty for the hearing impaired?

There have been a long series of attempts to modify the standard SII procedure ANSI S3.5(1997)
to include some basic aspects of hearing loss in predictions of speech intelligibility
for practical purposes, for example

Author = {Pavlovic, C.V. and Studebaker, G.A. and Sherbecoe, R.L.},
Journal = jasa,
Pages = {50-57},
Title = {An articulation index based procedure for predicting the speech recognition performance of hearing-impaired individuals},
Volume = {80},
Year = {1986}}

Author = {Ching, Teresa Y C and Dillon, Harvey and Byrne, Denis},
Journal = jasa,
Number = {2},
Pages = {1128-1140},
Title = {Speech recognition of hearing-impaired listeners: predictions from audibility and the limited role of high-frequency amplification},
Volume = {103},
Year = {1998}}

Author = {Ching, Teresa Y C and Dillon, Harvey and Katsch, Richard and Byrne, Denis},
Journal = {Ear and Hearing},
Number = {3},
Pages = {212-224},
Title = {Maximising effective audibility in hearing aid fitting},
Volume = {22},
Year = {2001}}

The SII approach itself, and those modifications, are of course all too simple to give a realistic
model of all the various physiological factors that can reduce speech intelligibility.
Nevertheless, the amazing thing is that even those very simple models actually account
astonishingly well for some results of speech tests in noise, e.g.

Author = {Magnusson, L.},
Journal = {Scandinavian Audiology},
Number = {4},
Pages = {215-222},
Title = {Predicting the speech recognition performance of elderly individuals with sensorineural hearing impairment},
Volume = {25},
Year = {1996}}

For some special purposes, it may even be more reliable
to use the acoustical prediction than to use a real speech-recognition test!

Author = {Magnusson, Lennart and Karlsson, Mia and Leijon, Arne},
Journal = {Ear and Hearing},
Number = {1},
Pages = {46-57},
Title = {Predicted and measured speech recognition performance in noise with linear amplification},
Volume = {22},
Year = {2001}}

Still we are probably far away from any physiologically realistic standard.

However, given any (more or less realistic) auditory model, it is always possible to estimate
the amount of speech information that can be transmitted through the model, e.g.

Address = {Antwerpen, BE},
Author = {Svante Stadler and Arne Leijon and Bj{\"o}rn Hagerman},
Booktitle = {Interspeech 07},
Title = {An Information theoretic approach to estimate speech intelligibility for normal and impaired hearing},
Year = {2007}}

This approach is equivalent to testing how well an ideal automatic speech-recognition system can perform, given the
speech signal output from the auditory model.

Best wishes,
Arne Leijon