diff --git a/core/lib/Drupal/Core/Field/Plugin/migrate/field/Email.php b/core/lib/Drupal/Core/Field/Plugin/migrate/field/Email.php
index 3b490f0..6a09f15 100644
--- a/core/lib/Drupal/Core/Field/Plugin/migrate/field/Email.php
+++ b/core/lib/Drupal/Core/Field/Plugin/migrate/field/Email.php
@@ -38,9 +38,17 @@ public function getFieldFormatterMap() {
   }
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     $process = [
       'plugin' => 'iterator',
       'source' => $field_name,
diff --git a/core/modules/datetime/src/Plugin/migrate/field/DateField.php b/core/modules/datetime/src/Plugin/migrate/field/DateField.php
index 0dd56c9..d1ecedb 100644
--- a/core/modules/datetime/src/Plugin/migrate/field/DateField.php
+++ b/core/modules/datetime/src/Plugin/migrate/field/DateField.php
@@ -31,9 +31,17 @@ public function getFieldWidgetMap() {
   }
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     switch ($data['type']) {
       case 'date':
         $from_format = 'Y-m-d\TH:i:s';
diff --git a/core/modules/datetime/src/Plugin/migrate/field/d6/DateField.php b/core/modules/datetime/src/Plugin/migrate/field/d6/DateField.php
index c4e7b49..29601a5 100644
--- a/core/modules/datetime/src/Plugin/migrate/field/d6/DateField.php
+++ b/core/modules/datetime/src/Plugin/migrate/field/d6/DateField.php
@@ -36,9 +36,17 @@ public function getFieldWidgetMap() {
   }
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     switch ($data['type']) {
       case 'date':
         $from_format = 'Y-m-d\TH:i:s';
diff --git a/core/modules/file/src/Plugin/migrate/field/d6/FileField.php b/core/modules/file/src/Plugin/migrate/field/d6/FileField.php
index 930c13b..9b81e17 100644
--- a/core/modules/file/src/Plugin/migrate/field/d6/FileField.php
+++ b/core/modules/file/src/Plugin/migrate/field/d6/FileField.php
@@ -38,9 +38,17 @@ public function getFieldFormatterMap() {
   }
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     $process = [
       'plugin' => 'd6_field_file',
       'source' => $field_name,
diff --git a/core/modules/file/src/Plugin/migrate/field/d7/FileField.php b/core/modules/file/src/Plugin/migrate/field/d7/FileField.php
index 4243d43..608721f 100644
--- a/core/modules/file/src/Plugin/migrate/field/d7/FileField.php
+++ b/core/modules/file/src/Plugin/migrate/field/d7/FileField.php
@@ -14,9 +14,17 @@
 class FileField extends D6FileField {
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     $process = [
       'plugin' => 'iterator',
       'source' => $field_name,
diff --git a/core/modules/file/src/Plugin/migrate/field/d7/ImageField.php b/core/modules/file/src/Plugin/migrate/field/d7/ImageField.php
index 7783ae2..f570407 100644
--- a/core/modules/file/src/Plugin/migrate/field/d7/ImageField.php
+++ b/core/modules/file/src/Plugin/migrate/field/d7/ImageField.php
@@ -14,9 +14,17 @@
 class ImageField extends FieldPluginBase {
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     $process = [
       'plugin' => 'iterator',
       'source' => $field_name,
diff --git a/core/modules/link/src/Plugin/migrate/field/d6/LinkField.php b/core/modules/link/src/Plugin/migrate/field/d6/LinkField.php
index 0d03656..c9a5ea1 100644
--- a/core/modules/link/src/Plugin/migrate/field/d6/LinkField.php
+++ b/core/modules/link/src/Plugin/migrate/field/d6/LinkField.php
@@ -35,9 +35,17 @@ public function getFieldFormatterMap() {
   }
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     $process = [
       'plugin' => 'd6_field_link',
       'source' => $field_name,
diff --git a/core/modules/migrate_drupal/src/Plugin/MigrateFieldInterface.php b/core/modules/migrate_drupal/src/Plugin/MigrateFieldInterface.php
index 2aac5d1..de19646 100644
--- a/core/modules/migrate_drupal/src/Plugin/MigrateFieldInterface.php
+++ b/core/modules/migrate_drupal/src/Plugin/MigrateFieldInterface.php
@@ -93,7 +93,7 @@ public function getFieldWidgetMap();
    * @param array $data
    *   The array of field data from FieldValues::fieldData().
    */
-  public function processFieldValues(MigrationInterface $migration, $field_name, $data);
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data);
 
   /**
    * Computes the destination type of a migrated field.
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/cckfield/CckFieldPluginBase.php b/core/modules/migrate_drupal/src/Plugin/migrate/cckfield/CckFieldPluginBase.php
index da1c7e9..b78570e 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/cckfield/CckFieldPluginBase.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/cckfield/CckFieldPluginBase.php
@@ -20,6 +20,14 @@
 abstract class CckFieldPluginBase extends FieldPluginBase {
 
   /**
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
+   */
+  public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
    * Apply any custom processing to the field bundle migrations.
    *
    * @param \Drupal\migrate\Plugin\MigrationInterface $migration
@@ -29,7 +37,7 @@
    * @param array $data
    *   The array of field data from FieldValues::fieldData().
    */
-  public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     // Provide a bridge to the old method declared on the interface and now an
     // abstract method in this class.
     return $this->processCckFieldValues($migration, $field_name, $data);
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/field/FieldPluginBase.php b/core/modules/migrate_drupal/src/Plugin/migrate/field/FieldPluginBase.php
index dc115ab..024f3a5 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/field/FieldPluginBase.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/field/FieldPluginBase.php
@@ -93,9 +93,17 @@ public function processFieldFormatter(MigrationInterface $migration) {
   }
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     $process = [
       'plugin' => 'get',
       'source' => $field_name,
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/field/NodeReference.php b/core/modules/migrate_drupal/src/Plugin/migrate/field/NodeReference.php
index 1579afa..21b05d7 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/field/NodeReference.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/field/NodeReference.php
@@ -16,9 +16,17 @@
 class NodeReference extends FieldPluginBase {
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     $process = [
       'plugin' => 'iterator',
       'source' => $field_name,
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/field/UserReference.php b/core/modules/migrate_drupal/src/Plugin/migrate/field/UserReference.php
index 11df8ec..2099d96 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/field/UserReference.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/field/UserReference.php
@@ -16,9 +16,17 @@
 class UserReference extends FieldPluginBase {
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     $process = [
       'plugin' => 'iterator',
       'source' => $field_name,
diff --git a/core/modules/taxonomy/src/Plugin/migrate/field/TaxonomyTermReference.php b/core/modules/taxonomy/src/Plugin/migrate/field/TaxonomyTermReference.php
index 56ec20a..958901a 100644
--- a/core/modules/taxonomy/src/Plugin/migrate/field/TaxonomyTermReference.php
+++ b/core/modules/taxonomy/src/Plugin/migrate/field/TaxonomyTermReference.php
@@ -17,9 +17,17 @@
 class TaxonomyTermReference extends FieldPluginBase {
 
   /**
-   * {@inheritdoc}
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
    */
   public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $data) {
     $process = [
       'plugin' => 'iterator',
       'source' => $field_name,
diff --git a/core/modules/text/src/Plugin/migrate/field/d6/TextField.php b/core/modules/text/src/Plugin/migrate/field/d6/TextField.php
index 62deeee..04c6bfc 100644
--- a/core/modules/text/src/Plugin/migrate/field/d6/TextField.php
+++ b/core/modules/text/src/Plugin/migrate/field/d6/TextField.php
@@ -40,9 +40,17 @@ public function getFieldFormatterMap() {
   }
 
   /**
+   * @deprecated in Drupal 8.5.x, to be removed before Drupal 9.0.x. Use
+   * defineFieldValueProcess() instead.
+   */
+  public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    return $this->defineFieldValueProcess($migration, $field_name, $data);
+  }
+
+  /**
    * {@inheritdoc}
    */
-  public function processFieldValues(MigrationInterface $migration, $field_name, $field_info) {
+  public function defineFieldValueProcess(MigrationInterface $migration, $field_name, $field_info) {
     $widget_type = isset($field_info['widget_type']) ? $field_info['widget_type'] : $field_info['widget']['type'];
 
     if ($widget_type == 'optionwidgets_onoff') {