A Network Diagram for a project you are managing is presented below:

$4\mathrm{.}1$ Calculate the Early Start; Late Start; Early Finish & Late Finish for all activities. $(15)$

$4\mathrm{.}2$ Compute the $$slack$$ time for each activity. $(5)$

$4\mathrm{.}3$ Identify all the paths and the Critical Path.