the lev suite of computer programs was developed at the transport and road research laboratory for analysing the data obtained in the 1971 reading area travel survey. the lev suite is written in fortran 4 and has been successfully run on icl system 4, icl 1900 series and ibm 360 computers. this report provides the user with a guide to the structure and scope of the suite and includes a detailed specification of the input data for the programs. the primary functions of the suite are the manipulation, checking for internal consistency and tabulation of sets of survey or similar data. however, the suite can be used to perform a much wider range of data analysis operations. (a)

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