The following dataset contains randomly generated problem instances for the related machine scheduling problem with job's release dates and due dates. There are 4 instance classes each of which contains 10 random instances (i.e., 10 text files) with n=120 jobs and m=26 machines. The instance classes differ one from another in the expected relative width of job's time windows. The text file structure is as follows: n=<number of jobs>; m=<number of machines>; p_{ij}= <n*m matrix: each entry in j-th column and i-th row corresponds to the processing time of job j on machine i>; r_j= <vector with n elements: the j-th element corresponds to the release date of job j>; d_j= <vector with n elements: the j-th element corresponds to the due date of job j>; The jobs are sorted by release date in ascending order.