<prompt> A systematic observation and recording of activities of one or more individuals at random interval is done inSystems analysisNetwork analysisWork samplingInputOutput analysis  <response>: Work samplingIt is systematic observation and recording of activities of one or more individuals, carried out at predetermined or random intervals.It provides quantitative measurement of various activities.It helps in standardizing the methods of performing jobs and determining the manpower needs in any organization.Input-out analysisInput All health service activities which consume resources manpower, money, material and time.Output Useful outcomes cases treated, lives saved.Input-output analysis shows how much of each input is needed to produce a unit amount of each output.Systemic analysisSystemic analysis is essentially finding the cost-effectiveness of the available alternatives. 