# NOT RUN {
sch <- sch_new() %>%
sch_title("Fictitious Project Example") %>%
sch_reference("VANHOUCKE, Mario. Measuring time:
improving project performance using earned value management.
Gent: Springer, 2009, p. 18") %>%
sch_add_activity( 2L, "a2" , 4L, 5L, 12L) %>%
sch_add_activity( 3L, "a3" , 9L, 10L) %>%
sch_add_activity( 4L, "a4" , 1L, 6L) %>%
sch_add_activity( 5L, "a5" , 4L, 9L) %>%
sch_add_activity( 6L, "a6" , 5L, 7L) %>%
sch_add_activity( 7L, "a7" , 1L, 8L,11L) %>%
sch_add_activity( 8L, "a8" , 7L, 12L) %>%
sch_add_activity( 9L, "a9" , 8L, 12L) %>%
sch_add_activity(10L, "a10", 3L, 12L) %>%
sch_add_activity(11L, "a11", 3L, 12L) %>%
sch_add_activity(12L, "a12", 0L) %>%
sch_plan()
sch_predecessors(sch, 2) # nothing
sch_predecessors(sch, 7) # 6
sch_predecessors(sch, 10) # 3
# }
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