diff --git a/app/Models/Audition.php b/app/Models/Audition.php
index 6c86d5f..9ae5c8a 100644
--- a/app/Models/Audition.php
+++ b/app/Models/Audition.php
@@ -10,6 +10,7 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\HasOne;
 use Illuminate\Support\Collection;
 
 use function in_array;
@@ -165,6 +166,11 @@ class Audition extends Model
         return $this->hasMany(Seat::class);
     }
 
+    public function prelimDefinition(): HasOne
+    {
+        return $this->hasOne(PrelimDefinition::class);
+    }
+
     /**
      * @codeCoverageIgnoreStart
      */
diff --git a/app/Models/prelim_definition.php b/app/Models/PrelimDefinition.php
similarity index 94%
rename from app/Models/prelim_definition.php
rename to app/Models/PrelimDefinition.php
index 07480b3..dfa7f47 100644
--- a/app/Models/prelim_definition.php
+++ b/app/Models/PrelimDefinition.php
@@ -5,7 +5,7 @@ namespace App\Models;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
-class prelim_definition extends Model
+class PrelimDefinition extends Model
 {
     protected $fillable = [
         'audition_id',
diff --git a/database/migrations/2025_09_11_141701_create_prelim_definitions_table.php b/database/migrations/2025_09_11_141701_create_prelim_definitions_table.php
index b374410..fbb61a6 100644
--- a/database/migrations/2025_09_11_141701_create_prelim_definitions_table.php
+++ b/database/migrations/2025_09_11_141701_create_prelim_definitions_table.php
@@ -13,7 +13,7 @@ return new class extends Migration
     {
         Schema::create('prelim_definitions', function (Blueprint $table) {
             $table->id();
-            $table->foreignIdFor(Audition::class)->constrained()->cascadeOnDelete()->cascadeOnUpdate();
+            $table->foreignIdFor(Audition::class)->unique()->constrained()->cascadeOnDelete()->cascadeOnUpdate();
             $table->foreignIdFor(Room::class)->nullable()->constrained()->nullOnDelete()->cascadeOnUpdate();
             $table->integer('order_in_room')->nullable();
             $table->foreignIdFor(ScoringGuide::class)->nullable()->constrained()->nullOnDelete()->cascadeOnUpdate();
diff --git a/tests/Feature/app/Models/AuditionTest.php b/tests/Feature/app/Models/AuditionTest.php
index 786dc1b..9c7346c 100644
--- a/tests/Feature/app/Models/AuditionTest.php
+++ b/tests/Feature/app/Models/AuditionTest.php
@@ -3,6 +3,7 @@
 use App\Models\Audition;
 use App\Models\Ensemble;
 use App\Models\Entry;
+use App\Models\PrelimDefinition;
 use App\Models\Room;
 use App\Models\ScoringGuide;
 use App\Models\Seat;
@@ -198,3 +199,16 @@ it('can return its seats if any exits', function () {
     expect($this->audition->seats()->count())->toBe(5)
         ->and($this->audition->seats->first())->toBeInstanceOf(Seat::class);
 });
+
+it('returns null if a prelim definition is requested and none exists', function () {
+    expect($this->audition->prelimDefinition)->toBeNull();
+});
+
+it('can return its prelim definition if one exists', function () {
+
+    $prelimDefinition = PrelimDefinition::create([
+        'audition_id' => $this->audition->id,
+        'passing_score' => 72,
+    ]);
+    expect($this->audition->prelimDefinition->passing_score)->toEqual(72);
+});
diff --git a/tests/Feature/app/Models/PrelimDefinitionTest.php b/tests/Feature/app/Models/PrelimDefinitionTest.php
new file mode 100644
index 0000000..27c10cf
--- /dev/null
+++ b/tests/Feature/app/Models/PrelimDefinitionTest.php
@@ -0,0 +1,41 @@
+<?php
+
+use App\Models\Audition;
+use App\Models\PrelimDefinition;
+use App\Models\Room;
+use App\Models\ScoringGuide;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    $this->audition = Audition::factory()->create();
+    $this->prelim = PrelimDefinition::create([
+        'audition_id' => $this->audition->id,
+        'passing_score' => 80,
+    ]);
+});
+
+it('can provide its audition', function () {
+    expect($this->prelim->audition->name)->toEqual($this->audition->name);
+});
+
+it('can return its room if one is set', function () {
+    $room = Room::factory()->create();
+    $this->prelim->room()->associate($room);
+    expect($this->prelim->room->name)->toEqual($room->name);
+});
+
+it('returns null if no room is set', function () {
+    expect($this->prelim->room)->toBeNull();
+});
+
+it('returns its scoring guide if one is set', function () {
+    $guide = ScoringGuide::factory()->create();
+    $this->prelim->scoringGuide()->associate($guide);
+    expect($this->prelim->scoringGuide->name)->toEqual($guide->name);
+});
+
+it('returns null if no scoring guide is set', function () {
+    expect($this->prelim->scoringGuide)->toBeNull();
+});