<prompt> In the critical path method, illness is the maximum if the causal factors affect a paicular period of life. The vulnerable period is -ShoestLongestCheapestCostliest  <response>: -Critical path method : the longest path of the network. - if any activity along the critical path is delayed, the whole project will be delayed. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:872 p 