Systems, methods and computer program products are configured for conducting time and motion studies using a portable computing device having a memory, wherein the internal clock of the portable computing device measures the elapsed time for an observed activity as a user (i.e., time and motion study analyst) identifies the observed activity and any associated parameters, counts, measurements or comments via one or more customized user interfaces displayed on the portable computing device screen. The customized user interfaces are generated from data tables created during setup. The elapsed time, activity name, and the associated parameters, counts and comments are recorded in the memory of the portable computing device as an activity record for subsequent analysis.