diff --git a/java/src/org/broadinstitute/sting/playground/gatk/walkers/HybSelPerformanceWalker.java b/java/src/org/broadinstitute/sting/playground/gatk/walkers/HybSelPerformanceWalker.java
new file mode 100755
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+++ b/java/src/org/broadinstitute/sting/playground/gatk/walkers/HybSelPerformanceWalker.java
@@ -0,0 +1,115 @@
+package org.broadinstitute.sting.playground.gatk.walkers;
+
+import org.broadinstitute.sting.gatk.LocusContext;
+import org.broadinstitute.sting.gatk.walkers.LocusWalker;
+import org.broadinstitute.sting.gatk.refdata.ReferenceOrderedDatum;
+import org.broadinstitute.sting.gatk.refdata.RefMetaDataTracker;
+import org.broadinstitute.sting.utils.cmdLine.Argument;
+import org.broadinstitute.sting.utils.Pair;
+import org.broadinstitute.sting.utils.GenomeLoc;
+
+import java.util.List;
+
+import net.sf.samtools.SAMRecord;
+
+public class HybSelPerformanceWalker extends LocusWalker<Integer, HybSelPerformanceWalker.TargetInfo> {
+    public static class TargetInfo {
+        public int counts = 0;
+
+        // did at least two reads hit this target
+        public boolean hitTwice = false;
+
+        // TODO: track max and min?
+        // TODO: median rather than average?
+        // TODO: bin into segments? (requires knowing position)
+    }
+
+//    @Argument(fullName="suppressLocusPrinting",required=false,defaultValue="false")
+//    public boolean suppressPrinting;
+
+    public Integer map(RefMetaDataTracker tracker, char ref, LocusContext context) {
+        List<SAMRecord> reads = context.getReads();
+
+        int depth = 0;
+        for ( int i = 0; i < reads.size(); i++ )
+        {
+            SAMRecord read = reads.get(i);
+
+            // TODO: is there a better way to do this?
+            if (read.getNotPrimaryAlignmentFlag() ||
+                read.getDuplicateReadFlag() ||
+                read.getReadUnmappedFlag() ||
+                read.getMappingQuality() <= -1
+                    ) {
+                continue;
+            }
+            depth++;
+        }
+
+        return depth;
+    }
+
+    /**
+     * Return true if your walker wants to reduce each interval separately.  Default is false.
+     *
+     * If you set this flag, several things will happen.
+     *
+     * The system will invoke reduceInit() once for each interval being processed, starting a fresh reduce
+     * Reduce will accumulate normally at each map unit in the interval
+     * However, onTraversalDone(reduce) will be called after each interval is processed.
+     * The system will call onTraversalDone( GenomeLoc -> reduce ), after all reductions are done,
+     *   which is overloaded here to call onTraversalDone(reduce) for each location
+     */
+    public boolean isReduceByInterval() {
+        return true;
+    }
+
+    public TargetInfo reduceInit() { return new TargetInfo(); }
+
+    public TargetInfo reduce(Integer value, TargetInfo sum) {
+        sum.counts += value;
+        if (value >= 2) { sum.hitTwice = true; }
+        return sum;
+    }
+
+    public void onTraversalDone(TargetInfo result) {
+    }
+
+    @Override
+    public void onTraversalDone(List<Pair<GenomeLoc, TargetInfo>> results) {
+        out.println("location\tlength\tavg_coverage\tnormalized_coverage\thit_twice");
+
+        // first zip through and calculate the total average coverage
+        long totalCoverage = 0;
+        long basesConsidered = 0;
+        for(Pair<GenomeLoc, TargetInfo> pair : results) {
+            GenomeLoc target = pair.getFirst();
+            TargetInfo ti = pair.getSecond();
+
+            // as long as it was hit twice, count it
+            if(ti.hitTwice) {
+                long length = target.getStop() - target.getStart() + 1;
+                totalCoverage += ti.counts;
+                basesConsidered += length;
+            }
+        }
+        double meanTargetCoverage = totalCoverage / basesConsidered;
+
+
+        for(Pair<GenomeLoc, TargetInfo> pair : results) {
+            GenomeLoc target = pair.getFirst();
+            TargetInfo ti = pair.getSecond();
+            long length = target.getStop() - target.getStart() + 1;
+
+            double avgCoverage = ((double)ti.counts / (double)length);
+            double normCoverage = avgCoverage / meanTargetCoverage;
+
+            out.printf("%s:%d-%d\t%d\t%6.4f\t%6.4f\t%d\n",
+                       target.getContig(), target.getStart(), target.getStop(), length,
+                        avgCoverage, normCoverage, ((ti.hitTwice)?1:0)
+                    );
+
+
+        }
+    }
+}
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