`(sum_(i in N)min("PV"_(i,ES),"EV"_(i,AT)))/(sum_(i in N)"PV"_(i,ES))`
`p` Schedule Adherence (from 0 to 1)
`N` Set of activities in the project
`"PV"_(i,ES)` Planed Value of activity i at time ES
`"EV"_(i,AT)` Earned Value of activity i at actual time AT
[Mario Vanhoucke. Measuring Schedule Adherence. The Measurable News. 2013.04]