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The trainer may give the feedback or the learners may give feedback to each other . " Although it is common to incorporate techniques such as demonstrations , drill and practice , and simulation to skill areas such as firearms training or field sobriety testing , other areas do not readily lend themselves to the utilization of techniques that enhance the learning process . Much of the research data used in the EECS environment is stored on other servers ; the only items stored on the EECS server are home directories , data that need to be shared , or data that users want to have backed up . The fact that NFS requests are reordered means that access patterns that are in fact entirely sequential from the perspective of the client may appear , to the server , to contain some element of randomness . In addition , our changes to nfsheur are very minor and add no complexity to the NFS server .