Hi Ian, in the new array package, Data.Array.Base is a hidden module. Trouble is, it defines wORD_SCALE, fLOAT_SCALE, dOUBLE_SCALE and various bOOL_* things which are generally useful and used by NDP. I could work around this by simply redefining them in the ndp package, but I don't like that. Should they perhaps be exported from array? Cheers, Roman