the product development group at landon corporation has been working on a new computer software product that has the potential to capture a large market share. through outside sources, landon's management learned that a competitor is working to introduce a similar product. as a result, landon's top management increased its pressure on the product development group. the group's leader turned to pert/cpm as an aid to scheduling the activities remaining before the new product can be brought to the market. the project network is as follows.