diff --git a/src/Exclusion.cpp b/src/Exclusion.cpp
index eccd5243..ce05a47a 100644
--- a/src/Exclusion.cpp
+++ b/src/Exclusion.cpp
@@ -35,7 +35,8 @@
 // and lunch. By default there are none, but they may be configured. Once there
 // are exclusions defined, the :fill functionality is enabled.
 //
-// Exclusions are instantiated from the 'define exclusions:' rule.
+// Exclusions are instantiated from the 'define exclusions:' rule. This method
+// simply validates.
 //
 // Syntax:
 //   exc holidays en-US
@@ -99,3 +100,54 @@ std::vector <std::string> Exclusion::tokens () const
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// A single exclusion directive is expanded to a tuple of start/end timestamps,
+// when evaluated within a closed range. These tuples represent windows of time
+// that are not available for tracking.
+std::vector <Interval> Exclusion::intervals (
+  const Interval& interval) const
+{
+       if (_tokens[1] == "holidays") return expandIntervalsHolidays (interval);
+  else if (_tokens[1] == "work")     return expandIntervalsWork     (interval);
+  else if (_tokens[1] == "week")     return expandIntervalsWeek     (interval);
+  else if (_tokens[1] == "day")      return expandIntervalsDay      (interval);
+
+  throw std::string ("Exclusion is not initialized.");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+std::vector <Interval> Exclusion::expandIntervalsHolidays (
+  const Interval& interval) const
+{
+  std::vector <Interval> result;
+
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+std::vector <Interval> Exclusion::expandIntervalsWork (
+  const Interval& interval) const
+{
+  std::vector <Interval> result;
+
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+std::vector <Interval> Exclusion::expandIntervalsWeek (
+  const Interval& interval) const
+{
+  std::vector <Interval> result;
+
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+std::vector <Interval> Exclusion::expandIntervalsDay (
+  const Interval& interval) const
+{
+  std::vector <Interval> result;
+
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
diff --git a/src/Exclusion.h b/src/Exclusion.h
index 74e9ccee..9bd63e73 100644
--- a/src/Exclusion.h
+++ b/src/Exclusion.h
@@ -27,6 +27,7 @@
 #ifndef INCLUDED_EXCLUSION
 #define INCLUDED_EXCLUSION
 
+#include <Interval.h>
 #include <vector>
 #include <string>
 
@@ -36,6 +37,13 @@ public:
   Exclusion () = default;
   void initialize (const std::string&);
   std::vector <std::string> tokens () const;
+  std::vector <Interval> intervals (const Interval&) const;
+
+private:
+  std::vector <Interval> expandIntervalsHolidays (const Interval&) const;
+  std::vector <Interval> expandIntervalsWork     (const Interval&) const;
+  std::vector <Interval> expandIntervalsWeek     (const Interval&) const;
+  std::vector <Interval> expandIntervalsDay      (const Interval&) const;
 
 private:
   std::vector <std::string> _tokens;