diff --git a/src/main/java/org/manifold/compiler/back/digital/DesignRuleCheck.java b/src/main/java/org/manifold/compiler/back/digital/Check.java
similarity index 78%
rename from src/main/java/org/manifold/compiler/back/digital/DesignRuleCheck.java
rename to src/main/java/org/manifold/compiler/back/digital/Check.java
index 737e539..f028ad4 100644
--- a/src/main/java/org/manifold/compiler/back/digital/DesignRuleCheck.java
+++ b/src/main/java/org/manifold/compiler/back/digital/Check.java
@@ -2,14 +2,14 @@
 
 import org.manifold.compiler.UndefinedBehaviourError;
 
-public abstract class DesignRuleCheck {
-  public abstract void check();
+public abstract class Check {
+  protected abstract void verify();
 
   protected Boolean result = null;
 
-  public boolean passed() {
+  public boolean run() {
     if (result == null) {
-      check();
+      verify();
       // ensure that the check set a result
       if (result == null) {
         throw new UndefinedBehaviourError(
diff --git a/src/main/java/org/manifold/compiler/back/digital/Netlist.java b/src/main/java/org/manifold/compiler/back/digital/Netlist.java
index c79ba16..7f0076f 100644
--- a/src/main/java/org/manifold/compiler/back/digital/Netlist.java
+++ b/src/main/java/org/manifold/compiler/back/digital/Netlist.java
@@ -17,19 +17,9 @@
 public class Netlist {
 
   private ConnectionType digitalWireType;
-  public ConnectionType getDigitalWireType() {
-    return digitalWireType;
-  }
   private PortTypeValue digitalInType;
-  public PortTypeValue getDigitalInType() {
-    return digitalInType;
-  }
   private PortTypeValue digitalOutType;
 
-  public PortTypeValue getDigitalOutType() {
-    return digitalOutType;
-  }
-
   private Map<String, Net> nets = new HashMap<>();
 
   public Map<String, Net> getNets() {
diff --git a/src/main/java/org/manifold/compiler/back/digital/DRC_NoMultipleDrivers.java b/src/main/java/org/manifold/compiler/back/digital/NoMultipleDriversCheck.java
similarity index 68%
rename from src/main/java/org/manifold/compiler/back/digital/DRC_NoMultipleDrivers.java
rename to src/main/java/org/manifold/compiler/back/digital/NoMultipleDriversCheck.java
index 02f0428..2332d8b 100644
--- a/src/main/java/org/manifold/compiler/back/digital/DRC_NoMultipleDrivers.java
+++ b/src/main/java/org/manifold/compiler/back/digital/NoMultipleDriversCheck.java
@@ -4,22 +4,30 @@
 
 import org.manifold.compiler.PortTypeValue;
 import org.manifold.compiler.PortValue;
+import org.manifold.compiler.UndeclaredIdentifierException;
+import org.manifold.compiler.UndefinedBehaviourError;
+import org.manifold.compiler.middle.Schematic;
 
 
-public class DRC_NoMultipleDrivers extends DesignRuleCheck {
+public class NoMultipleDriversCheck extends Check {
 
+  private Schematic schematic;
   private Netlist netlist;
-  private PortTypeValue digitalInType;
   private PortTypeValue digitalOutType;
 
-  public DRC_NoMultipleDrivers(Netlist netlist) {
+  public NoMultipleDriversCheck(Schematic schematic, Netlist netlist) {
+    this.schematic = schematic;
     this.netlist = netlist;
-    this.digitalInType = netlist.getDigitalInType();
-    this.digitalOutType = netlist.getDigitalOutType();
+    try {
+      this.digitalOutType = schematic.getPortType("digitalOut");
+    } catch (UndeclaredIdentifierException e) {
+      throw new UndefinedBehaviourError(
+          "schematic does not define digitalOut port type");
+    }
   }
 
   @Override
-  public void check() {
+  protected void verify() {
     System.err.println("expected digital out type = "
         + digitalOutType.toString());
     Map<String, Net> allNets = netlist.getNets();
@@ -47,6 +55,7 @@ public void check() {
        * nets are multiply driven, and the ports that are driving them. This
        * will be useful when showing the user the results of DRC so they can
        * correct the design.
+       * This is described in Issue #131.
        */
     }
     this.result = noMultipleDrivers;
diff --git a/src/test/java/org/manifold/compiler/back/TestDRC_NoMultipleDrivers.java b/src/test/java/org/manifold/compiler/back/TestNoMultipleDriversCheck.java
similarity index 83%
rename from src/test/java/org/manifold/compiler/back/TestDRC_NoMultipleDrivers.java
rename to src/test/java/org/manifold/compiler/back/TestNoMultipleDriversCheck.java
index ef427c5..e9913ab 100644
--- a/src/test/java/org/manifold/compiler/back/TestDRC_NoMultipleDrivers.java
+++ b/src/test/java/org/manifold/compiler/back/TestNoMultipleDriversCheck.java
@@ -13,14 +13,14 @@
 import org.junit.runners.Parameterized.Parameters;
 import org.manifold.compiler.ConnectionValue;
 import org.manifold.compiler.NodeValue;
-import org.manifold.compiler.back.digital.DRC_NoMultipleDrivers;
-import org.manifold.compiler.back.digital.DesignRuleCheck;
+import org.manifold.compiler.back.digital.Check;
 import org.manifold.compiler.back.digital.Netlist;
+import org.manifold.compiler.back.digital.NoMultipleDriversCheck;
 import org.manifold.compiler.middle.Schematic;
 import org.manifold.compiler.middle.SchematicException;
 
 @RunWith(Parameterized.class)
-public class TestDRC_NoMultipleDrivers {
+public class TestNoMultipleDriversCheck {
 
   @BeforeClass
   public static void setupClass() {
@@ -45,7 +45,7 @@ public static Collection<Object[]> data() throws SchematicException {
       case0.addConnection("in0_to_out0", in0_to_out0);
 
       Netlist netlist_case0 = new Netlist(case0);
-      Object[] case0_data = new Object[] { netlist_case0, true };
+      Object[] case0_data = new Object[] { case0, netlist_case0, true };
       testData.add(case0_data);
     }
     // END CASE 0
@@ -70,7 +70,7 @@ public static Collection<Object[]> data() throws SchematicException {
       case1.addConnection("in1_to_out0", in1_to_out0);
 
       Netlist netlist_case1 = new Netlist(case1);
-      Object[] case1_data = new Object[] { netlist_case1, false };
+      Object[] case1_data = new Object[] { case1, netlist_case1, false };
       testData.add(case1_data);
     }
     // END CASE 1
@@ -78,20 +78,21 @@ public static Collection<Object[]> data() throws SchematicException {
   }
 
   // test inputs
+  private Schematic schematic;
   private Netlist netlist;
   private boolean expectedCheckResult;
 
-  public TestDRC_NoMultipleDrivers(Netlist netlist, 
+  public TestNoMultipleDriversCheck(Schematic schematic, Netlist netlist, 
       Boolean expectedCheckResult) {
+    this.schematic = schematic;
     this.netlist = netlist;
     this.expectedCheckResult = expectedCheckResult;
   }
 
   @Test
   public void testDRC() {
-    DesignRuleCheck drc = new DRC_NoMultipleDrivers(netlist);
-    drc.check();
-    boolean actualCheckResult = drc.passed();
+    Check drc = new NoMultipleDriversCheck(schematic, netlist);
+    boolean actualCheckResult = drc.run();
     assertEquals(expectedCheckResult, actualCheckResult);
   }