diff --git a/src/main/java/ai/timefold/solver/benchmarks/examples/examination/domain/FollowingExam.java b/src/main/java/ai/timefold/solver/benchmarks/examples/examination/domain/FollowingExam.java
index eefd15af..05d7cc61 100644
--- a/src/main/java/ai/timefold/solver/benchmarks/examples/examination/domain/FollowingExam.java
+++ b/src/main/java/ai/timefold/solver/benchmarks/examples/examination/domain/FollowingExam.java
@@ -1,8 +1,8 @@
 package ai.timefold.solver.benchmarks.examples.examination.domain;
 
-import ai.timefold.solver.benchmarks.examples.examination.domain.solver.PeriodUpdatingVariableListener;
 import ai.timefold.solver.core.api.domain.entity.PlanningEntity;
 import ai.timefold.solver.core.api.domain.variable.ShadowVariable;
+import ai.timefold.solver.core.preview.api.domain.variable.declarative.ShadowSources;
 
 @PlanningEntity
 public class FollowingExam extends Exam {
@@ -21,9 +21,7 @@ public void setLeadingExam(LeadingExam leadingExam) {
     }
 
     @Override
-    @ShadowVariable(variableListenerClass = PeriodUpdatingVariableListener.class,
-            sourceEntityClass = LeadingExam.class,
-            sourceVariableName = "period")
+    @ShadowVariable(supplierName = "periodSupplier")
     public Period getPeriod() {
         return period;
     }
@@ -32,6 +30,11 @@ public void setPeriod(Period period) {
         this.period = period;
     }
 
+    @ShadowSources("leadingExam.period")
+    public Period periodSupplier() {
+        return leadingExam.getPeriod();
+    }
+
     // ************************************************************************
     // With methods
     // ************************************************************************
diff --git a/src/main/java/ai/timefold/solver/benchmarks/examples/examination/domain/solver/PeriodUpdatingVariableListener.java b/src/main/java/ai/timefold/solver/benchmarks/examples/examination/domain/solver/PeriodUpdatingVariableListener.java
deleted file mode 100644
index 3ba11cbd..00000000
--- a/src/main/java/ai/timefold/solver/benchmarks/examples/examination/domain/solver/PeriodUpdatingVariableListener.java
+++ /dev/null
@@ -1,51 +0,0 @@
-package ai.timefold.solver.benchmarks.examples.examination.domain.solver;
-
-import ai.timefold.solver.benchmarks.examples.examination.domain.Examination;
-import ai.timefold.solver.benchmarks.examples.examination.domain.FollowingExam;
-import ai.timefold.solver.benchmarks.examples.examination.domain.LeadingExam;
-import ai.timefold.solver.benchmarks.examples.examination.domain.Period;
-import ai.timefold.solver.core.api.domain.variable.VariableListener;
-import ai.timefold.solver.core.api.score.director.ScoreDirector;
-
-public class PeriodUpdatingVariableListener implements VariableListener<Examination, LeadingExam> {
-
-    @Override
-    public void beforeEntityAdded(ScoreDirector<Examination> scoreDirector, LeadingExam leadingExam) {
-        // Do nothing
-    }
-
-    @Override
-    public void afterEntityAdded(ScoreDirector<Examination> scoreDirector, LeadingExam leadingExam) {
-        updatePeriod(scoreDirector, leadingExam);
-    }
-
-    @Override
-    public void beforeVariableChanged(ScoreDirector<Examination> scoreDirector, LeadingExam leadingExam) {
-        // Do nothing
-    }
-
-    @Override
-    public void afterVariableChanged(ScoreDirector<Examination> scoreDirector, LeadingExam leadingExam) {
-        updatePeriod(scoreDirector, leadingExam);
-    }
-
-    @Override
-    public void beforeEntityRemoved(ScoreDirector<Examination> scoreDirector, LeadingExam leadingExam) {
-        // Do nothing
-    }
-
-    @Override
-    public void afterEntityRemoved(ScoreDirector<Examination> scoreDirector, LeadingExam leadingExam) {
-        // Do nothing
-    }
-
-    protected void updatePeriod(ScoreDirector<Examination> scoreDirector, LeadingExam leadingExam) {
-        Period period = leadingExam.getPeriod();
-        for (FollowingExam followingExam : leadingExam.getFollowingExamList()) {
-            scoreDirector.beforeVariableChanged(followingExam, "period");
-            followingExam.setPeriod(period);
-            scoreDirector.afterVariableChanged(followingExam, "period");
-        }
-    }
-
-}
diff --git a/src/main/java/ai/timefold/solver/benchmarks/micro/scoredirector/problems/ExaminationProblem.java b/src/main/java/ai/timefold/solver/benchmarks/micro/scoredirector/problems/ExaminationProblem.java
index 33cc1922..3f3b9def 100644
--- a/src/main/java/ai/timefold/solver/benchmarks/micro/scoredirector/problems/ExaminationProblem.java
+++ b/src/main/java/ai/timefold/solver/benchmarks/micro/scoredirector/problems/ExaminationProblem.java
@@ -1,5 +1,6 @@
 package ai.timefold.solver.benchmarks.micro.scoredirector.problems;
 
+import java.util.EnumSet;
 import java.util.Objects;
 
 import ai.timefold.solver.benchmarks.examples.examination.domain.Exam;
@@ -11,6 +12,7 @@
 import ai.timefold.solver.benchmarks.micro.scoredirector.Example;
 import ai.timefold.solver.benchmarks.micro.scoredirector.ScoreDirectorType;
 import ai.timefold.solver.core.config.score.director.ScoreDirectorFactoryConfig;
+import ai.timefold.solver.core.config.solver.PreviewFeature;
 import ai.timefold.solver.core.impl.domain.solution.descriptor.SolutionDescriptor;
 import ai.timefold.solver.persistence.common.api.domain.solution.SolutionFileIO;
 
@@ -33,8 +35,8 @@ protected ScoreDirectorFactoryConfig buildScoreDirectorFactoryConfig(ScoreDirect
 
     @Override
     protected SolutionDescriptor<Examination> buildSolutionDescriptor() {
-        return SolutionDescriptor.buildSolutionDescriptor(Examination.class, Exam.class, LeadingExam.class,
-                FollowingExam.class);
+        return SolutionDescriptor.buildSolutionDescriptor(EnumSet.of(PreviewFeature.DECLARATIVE_SHADOW_VARIABLES),
+                Examination.class, Exam.class, LeadingExam.class, FollowingExam.class);
     }
 
     @Override
diff --git a/src/main/resources/ai/timefold/solver/benchmarks/examples/examination/examinationSolverConfig.xml b/src/main/resources/ai/timefold/solver/benchmarks/examples/examination/examinationSolverConfig.xml
index df344efc..04b6a4a8 100644
--- a/src/main/resources/ai/timefold/solver/benchmarks/examples/examination/examinationSolverConfig.xml
+++ b/src/main/resources/ai/timefold/solver/benchmarks/examples/examination/examinationSolverConfig.xml
@@ -5,7 +5,7 @@
     <!--<environmentMode>FULL_ASSERT</environmentMode>-->
     <!-- To solve faster by saturating multiple CPU cores -->
     <!--<moveThreadCount>AUTO</moveThreadCount>-->
-
+    <enablePreviewFeature>DECLARATIVE_SHADOW_VARIABLES</enablePreviewFeature>
     <solutionClass>ai.timefold.solver.benchmarks.examples.examination.domain.Examination</solutionClass>
     <entityClass>ai.timefold.solver.benchmarks.examples.examination.domain.Exam</entityClass>
     <entityClass>ai.timefold.solver.benchmarks.examples.examination.domain.LeadingExam</entityClass>