diff --git a/db/periodic-table.sql b/db/periodic-table.sql
index dc1a451..9b47774 100644
--- a/db/periodic-table.sql
+++ b/db/periodic-table.sql
@@ -389,4 +389,94 @@ $$ LANGUAGE plpgsql;
 CREATE TRIGGER trigger_audit_requirements_groups
 BEFORE UPDATE OR DELETE ON requirements_groups
 FOR EACH ROW
-EXECUTE FUNCTION archive_requirements_groups_change();
\ No newline at end of file
+EXECUTE FUNCTION archive_requirements_groups_change();
+
+-- ACCEPTANCE_CRITERIA: Individual conditions a requirement must meet
+CREATE TABLE acceptance_criteria (
+  id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+  requirement_id INT NOT NULL,
+  criteria_text TEXT NOT NULL,
+  is_accepted BOOLEAN NOT NULL DEFAULT FALSE,
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  updated_at TIMESTAMPTZ DEFAULT NOW(),
+  
+  CONSTRAINT fk_ac_requirement FOREIGN KEY (requirement_id) REFERENCES requirements (id) ON DELETE CASCADE
+);
+
+-- Index for performance when loading a requirement's page
+CREATE INDEX idx_ac_requirement ON acceptance_criteria(requirement_id);
+
+CREATE OR REPLACE FUNCTION update_modified_column()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ language 'plpgsql';
+
+CREATE TRIGGER update_ac_modtime
+BEFORE UPDATE ON acceptance_criteria
+FOR EACH ROW
+EXECUTE FUNCTION update_modified_column();
+
+-- Add editor tracking to the main table
+ALTER TABLE acceptance_criteria 
+ADD COLUMN last_editor_id INT;
+
+ALTER TABLE acceptance_criteria
+ADD CONSTRAINT fk_ac_editor FOREIGN KEY (last_editor_id) REFERENCES users (id);
+
+-- ACCEPTANCE_CRITERIA_HISTORY: Tracks changes to criteria and acceptance state
+CREATE TABLE acceptance_criteria_history (
+  history_id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+  original_ac_id INT NOT NULL,
+  requirement_id INT,
+  criteria_text TEXT,
+  is_accepted BOOLEAN,
+  valid_from TIMESTAMPTZ,
+  valid_to TIMESTAMPTZ DEFAULT NOW(),
+  edited_by INT,
+
+  CONSTRAINT fk_ach_user FOREIGN KEY (edited_by) REFERENCES users (id)
+);
+
+-- Index for auditing specific requirements
+CREATE INDEX idx_ach_req ON acceptance_criteria_history(requirement_id);
+
+-- Function to archive the state of an acceptance criterion
+CREATE OR REPLACE FUNCTION archive_acceptance_criteria_change()
+RETURNS TRIGGER AS $$
+BEGIN
+  INSERT INTO acceptance_criteria_history (
+    original_ac_id,
+    requirement_id,
+    criteria_text,
+    is_accepted,
+    valid_from,
+    valid_to,
+    edited_by
+  )
+  VALUES (
+    OLD.id,
+    OLD.requirement_id,
+    OLD.criteria_text,
+    OLD.is_accepted,
+    OLD.updated_at, -- When this version started
+    NOW(),          -- When this version was replaced/deleted
+    OLD.last_editor_id
+  );
+
+  IF (TG_OP = 'DELETE') THEN
+    RETURN OLD;
+  ELSE
+    NEW.updated_at := NOW(); -- Update the timestamp on the current record
+    RETURN NEW;
+  END IF;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Bind the trigger to the table
+CREATE TRIGGER trigger_audit_acceptance_criteria
+BEFORE UPDATE OR DELETE ON acceptance_criteria
+FOR EACH ROW
+EXECUTE FUNCTION archive_acceptance_criteria_change();
\ No newline at end of file