Hello, I read a Fortran textbook, which says "Assumed-size dummy arrays are a holdover from earlier versions of Fortran. They should never be used in any new programs". But I find MPI3 has interfaces like MPI_Alltoallv(sendbuf, sendcounts, sdispls, sendtype, recvbuf, recvcounts, rdispls, recvtype, comm, ierror) ... INTEGER, INTENT(IN) :: sendcounts(*), sdispls(*), recvcounts(*), rdispls(*) ... I was wondering why MPI3 still uses it. Thanks. --Junchao Zhang