For each of the following long-term projects, provide a basis for estimating the percentage of the job that has been completed. The discussion in the text used the percentage of total estimated cost incurred during a year as the percentage completed. For this exercise identify bases other than cost for estimating the percentage completed.
a. Construction of a 50 kilometre stretch of highway;
b. Contract to remove contaminated earth from a factory site where toxic waste has been dumped for many decades;
c. Contract to overhaul of a large shipping vessel.