diff --git a/def/sortingCriteria.go b/def/sortingCriteria.go
index 994581a..b4b6213 100644
--- a/def/sortingCriteria.go
+++ b/def/sortingCriteria.go
@@ -1,29 +1,13 @@
 package def
 
-// Creating an enumeration of the resources in def.Task.
-var taskResourceNames []string
-
-type sortCriteria int
-
-// Map a task's resource name to the sorting criteria (an integer corresponding to the enumeration).
-func resourceToSortCriteria(resourceName string) sortCriteria {
-	// Appending resourceName to TaskResourceNames.
-	taskResourceNames = append(taskResourceNames, resourceName)
-
-	// Considering index of resource in TaskResourceNames to be the int mapping.
-	return sortCriteria(len(taskResourceNames) - 1)
-}
-
-func (sc sortCriteria) String() string {
-	return taskResourceNames[int(sc)]
-}
+// the sortBy function that takes a task reference and returns the resource to consider when sorting.
+type sortBy func (task *Task) float64
 
 // Possible Sorting Criteria
-// Note: the value of the string passed as argument to resourceToSortCriteria() should be the same (case-sensitive)
-// 	as the name of the of the corresponding resource in the struct.
+// Each holds a closure that fetches the required resource from the
+// 	given task reference.
 var (
-	CPU = resourceToSortCriteria("CPU")
-	RAM = resourceToSortCriteria("RAM")
-	Watts = resourceToSortCriteria("Watts")
-	Instances = resourceToSortCriteria("Instances")
+	SortByCPU = func (task *Task) float64 {return task.CPU}
+	SortByRAM = func (task *Task) float64 {return task.RAM}
+	SortByWatts = func (task *Task) float64 {return task.Watts}
 )
diff --git a/def/taskUtils.go b/def/taskUtils.go
index e175e5f..2a318dc 100644
--- a/def/taskUtils.go
+++ b/def/taskUtils.go
@@ -4,7 +4,6 @@ import (
 	"github.com/mdesenfants/gokmeans"
 	"sort"
 	"log"
-	"reflect"
 )
 
 // Information about a cluster of tasks
@@ -120,12 +119,9 @@ func labelAndOrder(clusters map[int][]Task, numberOfClusters int, taskObservatio
 // Be able to sort an array of tasks based on any of the tasks' resources.
 
 // Retrieve a sorter (same signature as 'Less' function in sort.Interface) for the given sorting criteria.
-func TaskSorter(sc sortCriteria, tasks []Task) func (i, j int) bool {
+type TasksToSort []Task
+func (ts TasksToSort) TaskSorter(sb sortBy) func (i, j int) bool {
 	return func (i, j int) bool {
-		taskIFields := reflect.Indirect(reflect.ValueOf(tasks[i]))
-		tasksJFields := reflect.Indirect(reflect.ValueOf(tasks[j]))
-		resourceI := taskIFields.FieldByName(sc.String()).Float()
-		resourceJ := tasksJFields.FieldByName(sc.String()).Float()
-		return resourceI <= resourceJ
+		return sb(&ts[i]) <= sb(&ts[j])
 	}
 }