diff --git a/include/Rivet/Makefile.am b/include/Rivet/Makefile.am
--- a/include/Rivet/Makefile.am
+++ b/include/Rivet/Makefile.am
@@ -1,180 +1,181 @@
 ## Internal headers - not to be installed
 nobase_dist_noinst_HEADERS =
 ## Public headers - to be installed
 nobase_pkginclude_HEADERS =
 
 
 ## Rivet interface
 nobase_pkginclude_HEADERS += \
   Rivet.hh \
   Run.hh \
   Event.hh \
   ParticleBase.hh \
   Particle.fhh Particle.hh \
   Jet.fhh Jet.hh \
   Projection.fhh Projection.hh \
   ProjectionApplier.hh \
   ProjectionHandler.hh \
   Analysis.hh \
   AnalysisHandler.hh \
   AnalysisInfo.hh \
   AnalysisBuilder.hh \
   AnalysisLoader.hh
 
 
 ## Build config stuff
 nobase_pkginclude_HEADERS += \
   Config/RivetCommon.hh \
   Config/RivetConfig.hh \
   Config/BuildOptions.hh
 
 
 ## Projections
 nobase_pkginclude_HEADERS += \
   Projections/AliceCommon.hh \
   Projections/AxesDefinition.hh \
   Projections/Beam.hh \
   Projections/BeamThrust.hh \
   Projections/CentralEtHCM.hh \
   Projections/CentralityProjection.hh \
   Projections/ChargedFinalState.hh \
   Projections/ChargedLeptons.hh \
   Projections/ConstLossyFinalState.hh \
   Projections/DirectFinalState.hh \
   Projections/DISFinalState.hh \
   Projections/DISKinematics.hh \
   Projections/DISLepton.hh \
   Projections/DressedLeptons.hh \
   Projections/FastJets.hh \
   Projections/FinalPartons.hh \
   Projections/FinalState.hh \
   Projections/FoxWolframMoments.hh \
   Projections/FParameter.hh \
   Projections/GeneratedPercentileProjection.hh \
   Projections/HadronicFinalState.hh \
   Projections/HeavyHadrons.hh \
   Projections/Hemispheres.hh \
   Projections/IdentifiedFinalState.hh \
   Projections/ImpactParameterProjection.hh \
   Projections/IndirectFinalState.hh \
   Projections/InitialQuarks.hh \
   Projections/InvMassFinalState.hh \
   Projections/JetAlg.hh \
   Projections/JetShape.hh \
   Projections/LeadingParticlesFinalState.hh \
   Projections/LossyFinalState.hh \
   Projections/MergedFinalState.hh \
   Projections/MissingMomentum.hh \
   Projections/NeutralFinalState.hh \
   Projections/NonHadronicFinalState.hh \
   Projections/NonPromptFinalState.hh \
   Projections/ParisiTensor.hh \
   Projections/ParticleFinder.hh \
   Projections/PartonicTops.hh \
   Projections/PercentileProjection.hh \
   Projections/PrimaryHadrons.hh \
   Projections/PrimaryParticles.hh \
   Projections/PromptFinalState.hh \
   Projections/SingleValueProjection.hh \
   Projections/SmearedParticles.hh \
   Projections/SmearedJets.hh \
   Projections/SmearedMET.hh \
   Projections/Sphericity.hh \
   Projections/Spherocity.hh \
   Projections/TauFinder.hh \
   Projections/Thrust.hh \
   Projections/TriggerCDFRun0Run1.hh \
   Projections/TriggerCDFRun2.hh \
+  Projections/TriggerProjection.hh \
   Projections/TriggerUA5.hh \
   Projections/UnstableFinalState.hh \
   Projections/UserCentEstimate.hh \
   Projections/VetoedFinalState.hh \
   Projections/VisibleFinalState.hh \
   Projections/WFinder.hh \
   Projections/ZFinder.hh
 ## Meta-projection convenience headers
 nobase_pkginclude_HEADERS +=   \
   Projections/FinalStates.hh \
   Projections/Smearing.hh
 
 
 ## Analysis base class headers
 # TODO: Move to Rivet/AnalysisTools header dir?
 nobase_pkginclude_HEADERS += \
   Analyses/MC_ParticleAnalysis.hh \
   Analyses/MC_JetAnalysis.hh \
   Analyses/MC_JetSplittings.hh
 
 
 ## Tools
 nobase_pkginclude_HEADERS += \
   Tools/AliceCommon.hh \
   Tools/BeamConstraint.hh \
   Tools/BinnedHistogram.hh \
   Tools/CentralityBinner.hh \
   Tools/Cmp.fhh \
   Tools/Cmp.hh \
   Tools/Cutflow.hh \
   Tools/Cuts.fhh \
   Tools/Cuts.hh \
   Tools/Exceptions.hh \
   Tools/JetUtils.hh \
   Tools/Logging.hh  \
   Tools/Random.hh  \
   Tools/ParticleBaseUtils.hh \
   Tools/ParticleIdUtils.hh \
   Tools/ParticleUtils.hh \
   Tools/ParticleName.hh \
   Tools/PrettyPrint.hh \
   Tools/RivetPaths.hh \
   Tools/RivetSTL.hh \
   Tools/RivetFastJet.hh \
   Tools/RivetHepMC.hh \
   Tools/RivetYODA.hh \
   Tools/RivetMT2.hh \
   Tools/SmearingFunctions.hh \
   Tools/MomentumSmearingFunctions.hh \
   Tools/ParticleSmearingFunctions.hh \
   Tools/JetSmearingFunctions.hh \
   Tools/TypeTraits.hh \
   Tools/Utils.hh \
   Tools/Nsubjettiness/AxesDefinition.hh \
   Tools/Nsubjettiness/ExtraRecombiners.hh \
   Tools/Nsubjettiness/MeasureDefinition.hh \
   Tools/Nsubjettiness/Njettiness.hh \
   Tools/Nsubjettiness/NjettinessPlugin.hh \
   Tools/Nsubjettiness/Nsubjettiness.hh \
   Tools/Nsubjettiness/TauComponents.hh \
   Tools/Nsubjettiness/XConePlugin.hh
 nobase_dist_noinst_HEADERS += \
   Tools/osdir.hh
 
 
 ## Maths
 nobase_pkginclude_HEADERS += \
   Math/Matrices.hh \
   Math/Vector3.hh \
   Math/VectorN.hh \
   Math/MatrixN.hh \
   Math/MatrixDiag.hh \
   Math/MathHeader.hh \
   Math/Vectors.hh \
   Math/LorentzTrans.hh \
   Math/Matrix3.hh \
   Math/MathUtils.hh \
   Math/Vector4.hh \
   Math/Math.hh \
   Math/Units.hh \
   Math/Constants.hh \
   Math/eigen/util.h \
   Math/eigen/regressioninternal.h \
   Math/eigen/regression.h \
   Math/eigen/vector.h \
   Math/eigen/ludecompositionbase.h \
   Math/eigen/ludecomposition.h \
   Math/eigen/linearsolver.h \
   Math/eigen/linearsolverbase.h \
   Math/eigen/matrix.h \
   Math/eigen/vectorbase.h \
   Math/eigen/projective.h \
   Math/eigen/matrixbase.h
diff --git a/include/Rivet/Projections/TriggerProjection.hh b/include/Rivet/Projections/TriggerProjection.hh
new file mode 100644
--- /dev/null
+++ b/include/Rivet/Projections/TriggerProjection.hh
@@ -0,0 +1,68 @@
+// -*- C++ -*-
+#ifndef RIVET_TRIGGERPROJECTION_HH
+#define RIVET_TRIGGERPROJECTION_HH
+
+#include "Rivet/Projection.hh"
+
+namespace Rivet {
+
+/** @brief Base class for projections returning a bool corresponding
+    to a trigger.
+
+    @author Leif Lönnblad
+
+    Project an event down to a single true or false value accessible
+    through the operator() function, where true means that the event
+    has passed some trigger criterion.
+
+*/
+class TriggerProjection: public Projection {
+
+public:
+
+  /// The default constructor.
+  TriggerProjection() : _passed(true) {
+    setName("TriggerProjection");
+  }
+  virtual ~TriggerProjection() {}
+  
+  /// Clone on the heap.
+  DEFAULT_RIVET_PROJ_CLONE(TriggerProjection);
+
+  /// Return true if the event has passed some trigger or selection
+  /// criteria.
+  bool operator()() const {
+    return _passed;
+  }
+
+protected:
+
+  virtual void project(const Event& e) {
+    pass();
+  }
+
+  /// Indicate that the event has passed the trigger.
+  void pass() {
+    _passed = true;
+  }
+
+  /// Compare projections
+  virtual int compare(const Projection&) const {
+    return 0;
+  }
+
+  /// Indicate that the event has failed the trigger.
+  void fail() {
+    _passed = false;
+  }
+
+private:
+
+  bool _passed;
+
+};
+
+}
+
+#endif
+