diff --git a/lib/appropriate_bodies/importers/induction_period_importer.rb b/lib/appropriate_bodies/importers/induction_period_importer.rb
index 3394afe4..ffe4f4d6 100644
--- a/lib/appropriate_bodies/importers/induction_period_importer.rb
+++ b/lib/appropriate_bodies/importers/induction_period_importer.rb
@@ -16,6 +16,14 @@ def length
         (finished_on || Time.zone.today) - started_on
       end
 
+      def finished?
+        finished_on.present? && number_of_terms.present?
+      end
+
+      def ongoing?
+        !finished?
+      end
+
       # used in notes
       def to_h
         { appropriate_body_id:, started_on:, finished_on:, induction_programme:, number_of_terms: }
@@ -83,6 +91,33 @@ def periods_by_trn
 
                 if sibling.appropriate_body_id == current.appropriate_body_id && sibling.induction_programme == current.induction_programme
                   case
+                  when current.started_on == sibling.started_on && current.finished? && sibling.ongoing?
+                    #               ┌─────────────────────────────────────────┐
+                    #   Current     │                  KEEP                   │
+                    #               └─────────────────────────────────────────┘
+                    #               ┌──────────────────────────────────────────────────────────>
+                    #   Sibling     │              DISCARD
+                    #               └──────────────────────────────────────────────────────────>
+                    current.notes << {
+                      heading: "Imported from DQT",
+                      body: "DQT held 2 induction periods for this teacher/appropriate body combination with the same start date. The ongoing one was discarded.",
+                      data: { originals: [original_sibling, original_current], combined: current.to_h }
+                    }
+                    keep.delete(sibling)
+                    keep << current
+                  when current.started_on == sibling.started_on && sibling.finished? && current.ongoing?
+                    #               ┌──────────────────────────────────────────────────────────>
+                    #   Current     │                  DISCARD
+                    #               └──────────────────────────────────────────────────────────>
+                    #               ┌─────────────────────────────────────────┐
+                    #   Sibling     │              KEEP                       │
+                    #               └─────────────────────────────────────────┘
+                    sibling.notes << {
+                      heading: "Imported from DQT",
+                      body: "DQT held 2 induction periods for this teacher/appropriate body combination with the same start date. The ongoing one was discarded.",
+                      data: { originals: [original_sibling, original_current], combined: sibling.to_h }
+                    }
+                    next
                   when sibling.range.cover?(current.range)
                     #                  ┌─────────────────────────────┐
                     #   Current        │           DISCARD           │
@@ -120,6 +155,7 @@ def periods_by_trn
                     #               ┌─────────────────────────────────────────┬───┐
                     #   Sibling     │                EXTEND                   │╳╳╳│
                     #               └─────────────────────────────────────────┴───┘
+
                     current.number_of_terms = [sibling.number_of_terms, current.number_of_terms].max
                     sibling.finished_on = current.finished_on
                     sibling.notes << {
diff --git a/spec/lib/appropriate_bodies/importers/induction_period_importer_spec.rb b/spec/lib/appropriate_bodies/importers/induction_period_importer_spec.rb
index 690de623..7ec3f084 100644
--- a/spec/lib/appropriate_bodies/importers/induction_period_importer_spec.rb
+++ b/spec/lib/appropriate_bodies/importers/induction_period_importer_spec.rb
@@ -128,6 +128,66 @@
         end
       end
 
+      context 'and the first period has an end date and terms but the second does not' do
+        let(:sample_csv_data) do
+          <<~CSV
+            appropriate_body_id,started_on,finished_on,induction_programme_choice,number_of_terms,trn
+            025e61e7-ec32-eb11-a813-000d3a228dfc,01/01/2012 00:00:00,03/03/2012 00:00:00,Full Induction Programme,3,2600071
+            025e61e7-ec32-eb11-a813-000d3a228dfc,01/01/2012 00:00:00,,Full Induction Programme,,2600071
+          CSV
+        end
+
+        subject { AppropriateBodies::Importers::InductionPeriodImporter.new(nil, csv: sample_csv) }
+
+        it 'it keeps the finished (first) period' do
+          expect(subject.periods_as_hashes_by_trn).to eql(
+            {
+              '2600071' => [
+                AppropriateBodies::Importers::InductionPeriodImporter::Row.new(
+                  started_on: Date.new(2012, 1, 1),
+                  finished_on: Date.new(2012, 3, 3),
+                  induction_programme: 'Full Induction Programme',
+                  appropriate_body_id: ab_1.legacy_id,
+                  trn: '2600071',
+                  number_of_terms: 3,
+                  notes: []
+                ).to_hash,
+              ]
+            }
+          )
+        end
+      end
+
+      context 'and the second period has an end date and terms but the first does not' do
+        let(:sample_csv_data) do
+          <<~CSV
+            appropriate_body_id,started_on,finished_on,induction_programme_choice,number_of_terms,trn
+            025e61e7-ec32-eb11-a813-000d3a228dfc,01/01/2012 00:00:00,,Full Induction Programme,,2600071
+            025e61e7-ec32-eb11-a813-000d3a228dfc,01/01/2012 00:00:00,03/03/2012 00:00:00,Full Induction Programme,3,2600071
+          CSV
+        end
+
+        subject { AppropriateBodies::Importers::InductionPeriodImporter.new(nil, csv: sample_csv) }
+
+        it 'it keeps the finished (second) period' do
+          expect(subject.periods_as_hashes_by_trn).to eql(
+            {
+              '2600071' => [
+                AppropriateBodies::Importers::InductionPeriodImporter::Row.new(
+                  started_on: Date.new(2012, 1, 1),
+                  finished_on: Date.new(2012, 3, 3),
+                  induction_programme: 'Full Induction Programme',
+                  appropriate_body_id: ab_1.legacy_id,
+                  trn: '2600071',
+                  number_of_terms: 3,
+                  notes: []
+                ).to_hash,
+              ]
+            }
+          )
+        end
+      end
+
       context 'and the second period ends after the first period has started' do
         let(:sample_csv_data) do
           <<~CSV