diff --git a/pert.coffee b/pert.coffee
index 6a31fc4..94c7588 100755
--- a/pert.coffee
+++ b/pert.coffee
@@ -1,47 +1,50 @@
 #!/usr/bin/env coffee
+chalk = require 'chalk'
 
-console.log "pert"
+verbose = no
 
-list = [{id: 0, depends: [], duration: 2}, { id: 1, depends: [0], duration: 3},{id: 2, depends: [0,1], duration: 4}]
+log = (x...) -> if verbose then console.log chalk.bold("Log:"), x...
+err = (x...) -> console.log chalk.bold (chalk.red "Error:"), x...
 
+# Returns the highest number in an array of numbers
 maxa = (l) -> return Math.max.apply null, l
 
 # Find the activity with given id
-toActivity = (id) ->
+toActivity = (id,list) ->
+  if !list? then err "list is",list
   item = {}
   list.forEach (x) -> if x.id is id then item = x
   return item
 
 # Find the item 
-calculateEndDay = (item) ->
+calculateEndDay = (item,list) ->
   if !item.startDay?
-    console.log "calculating start day of",item.id
-    item.startDay = calculateStartDay item
-  console.log "Start day of",item.id,":",item.startDay
+    log "calculating start day of",item.id
+    item.startDay = calculateStartDay item, list
+  log "start day of",item.id,"is",item.startDay
   item.endDay = item.startDay + item.duration
-  console.log "End Day of",item.id,":",item.endDay
+  log "end day of",item.id,"is",item.endDay
   return item.endDay
 
 # Find out which day the activity starts
-calculateStartDay = (item) ->
+calculateStartDay = (item,list) ->
   if item.depends.length is 0 then return item.startDay = 0
-  console.log "Deps:",item.depends.map(toActivity)
-  console.log "EndDays:",item.depends.map(toActivity).map(calculateEndDay)
-  max = maxa item.depends.map(toActivity).map(calculateEndDay)
-  console.log max
+  max = maxa item.depends.map((x) -> toActivity x,list).map((x) -> calculateEndDay x, list)
+  log "start day of",item.id,"is",max
   # write max delay time to each depend
   item.depends.forEach (x) ->
-    console.log "Writing permittedDelay to dependency", x
-    i = toActivity x
-    i.permittedDelay = max - calculateEndDay(i)
+    log "writing permittedDelay to dependency", x, "of", item
+    i = toActivity x, list
+    i.permittedDelay = max - calculateEndDay i, list
+    log "permitted delay of",x,"is",i.permittedDelay
   return item.startDay = max
 
 # Find out which activity has the highest id
-highestID = -> return maxa(list.map (x) -> x.id)
+highestID = (list) -> return maxa(list.map (x) -> x.id)
 
-calculate = ->
-  calculateEndDay toActivity(highestID())
-  list.forEach (x) -> if !x.permittedDelay? then x.final = true
+calculate = (list) ->
+  calculateEndDay (toActivity highestID(list), list), list
   return list
 
-console.log calculate()
+ex = [{id: 0, depends: [], duration: 2}, { id: 1, depends: [0], duration: 3},{id: 2, depends: [0,1], duration: 4}]
+console.log calculate ex