Japanese
Romaji
English
PV Type
Difficulty

Conditions
Tutorial
IA_Song_00.png
00.
ワールド・コーリング
Warudo Kouringu
World Calling
Game Video
☆☆☆☆☆☆☆☆☆☆
0
Always Available
Song List
IA_Song_01.png
01.
如月アテンション
Kisaragi Atenshon
Kisaragi Attention
Original Video
★☆☆☆☆☆☆☆☆☆
★★★☆☆☆☆☆☆☆
★★★★★★★☆☆☆
1
3
7
Always Available
IA_Song_02.png
02.
God only knows
God only knows
God only knows
3D / Costume Change
★☆☆☆☆☆☆☆☆☆
★★★☆☆☆☆☆☆☆
★★★★★★★☆☆☆
1
3
7
Always Available
IA_Song_03.png
03.
TSUBASA New Days
TSUBASA New Days
TSUBASA New Days
Game Video
★☆☆☆☆☆☆☆☆☆
★★★☆☆☆☆☆☆☆
★★★★★★★☆☆☆
1
3
7
Always Available
IA_Song_04.png
04.
アスノヒカリ
Asu no Hikari
Light of Tomorrow
Game Video
★☆☆☆☆☆☆☆☆☆
★★★☆☆☆☆☆☆☆
★★★★★★★☆☆☆
1
3
7
Always Available
IA_Song_05.png
05.
夕暮れの真相
Yuugure no Shinshou
The Truth of the Evening
3D / Costume Change
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Reach Level 2
IA_Song_06.png
06.
少年は教室がきらいだったのだ
Shounen wa Kyoushitsu ga Kiraidatta noda
The Boy Hated the Classroom
Original Video
★☆☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
1
4
7
Reach Level 2
IA_Song_07.png
07.
22世紀からのハロー
22 Seiki Kara no Harou
Hello from the 22nd Century
Original Video
★☆☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
1
4
7
Reach Level 2
IA_Song_08.png
08.
空想フォレスト
Kusou Foresuto
Imagination Forest
3D / Costume Change
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Reach Level 3
IA_Song_09.png
09.
ラヴ・サジタリウス
Ravu Sajitariusu
Love Sagittarius
Game Video
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Reach Level 3
IA_Song_10.png
10.
Re;BIRTH
Re;BIRTH
Re;BIRTH
Game Video
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Reach Level 3
IA_Song_11.png
11.
残る夏に花束を
Nokoru Natsu ni Hanataba wo
Remaining Summer Bouquet
3D / Costume Change
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Reach Level 5
IA_Song_12.png
12.
夕景イエスタデイ
Yuukei Iesutadei
Sunset Yesterday
Original Video
★★☆☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★☆☆☆
2
5
7
Reach Level 5
IA_Song_13.png
13.
夢見心地
Yumemi Gokochi
Dreamy State of Mind
Game Video
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Reach Level 5
IA_Song_14.png
14.
ライア
Raia
Liar
Original Video
★★☆☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★☆☆☆
2
5
7
Reach Level 5
IA_Song_15.png
15.
星空のライオン
Hoshizora no Lion
Lion of the Starry Sky
3D / Costume Change
★★☆☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★☆☆☆
2
5
7
Reach Level 7
IA_Song_16.png
16.
影炎≒Variation
Kagerou≒Variation
Shadow Haze≒Variation
Original Video
★★☆☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★☆☆☆
2
5
7
Reach Level 7
IA_Song_17.png
17.
チルドレンレコード
Chirudoren Rekoudo
Children Record
Game Video
★★☆☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★☆☆☆
2
5
7
Reach Level 7
IA_Song_18.png
18.
鹿驚
Kakashi
Scarecrow
Original Video
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★★☆☆
2
4
8
Reach Level 7
IA_Song_19.png
19.
Summer Songs
Summer Songs
Summer Songs
3D / Costume Change
★★☆☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
2
5
8
Reach Level 10
IA_Song_20.png
20.
オーヴァースレプト
Ovaasureputo
Overslept
Game Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 10
IA_Song_21.png
21.
リズの内心革命
Rizu no Naishin Kakumei
Revolution of Liz's Innermost Heart
Original Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 10
IA_Song_22.png
22.
アヤノの幸福理論
Ayano no Koufuku Riron
Ayano's Theory of Happiness
Game Video
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Reach Level 10
IA_Song_23.png
23.
ローレライ
Rorerai
Lorelei
3D / Costume Change
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Reach Level 11
IA_Song_24.png
24.
ばいばいスーパースター
Bai Bai Supaastaa
Bye-Bye Superstar
Original Video
★★☆☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
2
5
8
Reach Level 11
IA_Song_25.png
25.
Party Party
Party Party
Party Party
Game Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 11
IA_Song_26.png
26.
身代わりキボンヌ
Migawari Kibonnu
Replacement Hope
Original Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 11
IA_Song_27.png
27.
Over Drive
Over Drive
Over Drive
3D / Costume Change
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 13
IA_Song_28.png
28.
Falling Apart
Falling Apart
Falling Apart
Game Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 13
IA_Song_29.png
29.
日本橋高架下R計画
Nihonbashi Koukashita R Keikaku
Japan Bridge Overpass Under R Plan
Original Video
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Reach Level 13
IA_Song_30.png
30.
ページェント ~for a GLORY~
Pajento ~for a GLORY~
Pageant ~for a GLORY~
Game Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 13
IA_Song_31.png
31.
僕らに喜劇を見せてくれ
Bokura ni Kigeki wo Misete Kure
Show the Comedy to Us
Game Video
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★☆☆
4
6
8
Reach Level 13
IA_Song_32.png
32.
killer smile
killer smile
killer smile
3D / Costume Change
★★★☆☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
3
6
9
Reach Level 15
IA_Song_33.png
33.
クラウドライダー
Kuraudo Raidaa
Cloud Rider
Original Video
★★★☆☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
3
6
9
Reach Level 15
IA_Song_34.png
34.
銀河鉄道365
Ginga Tetsudou 365
Ginga Railway 365
Game Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 15
IA_Song_35.png
35.
延命治療
Enmei Chiryou
Life-Prolonging Treatment
Original Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 15
IA_Song_36.png
36.
キミのことが好きでゴメンナサイ
Kimi no Koto ga Suki de Gomennasai
I'm Sorry For Liking You
Original Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★★☆
3
5
9
Reach Level 15
IA_Song_37.png
37.
単色世界
Tanshoku Sekai
Monochromatic World
Original Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
Reach Level 17
IA_Song_38.png
38.
Crystal Prism
Crystal Prism
Crystal Prism
Game Video
★★★☆☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
3
6
9
Reach Level 17
IA_Song_39.png
39.
ITYNITED IDENTITY
ITYNITED IDENTITY
ITYNITED IDENTITY
3D / Costume Change
★★★☆☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
3
6
9
Reach Level 17
IA_Song_40.png
40.
Inner Arts
Inner Arts
Inner Arts
Original Video
★★★☆☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★☆
3
7
9
Reach Level 17
IA_Song_41.png
41.
RACER'S HIGH
RACER'S HIGH
RACER'S HIGH
Game Video
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
4
6
9
Reach Level 20
IA_Song_42.png
42.
ヘイセイカタクリズム
Heisei Katakurizumu
Heisei Cataclysm
Original Video
★★★☆☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
3
6
9
Reach Level 20
IA_Song_43.png
43.
ヘッドフォンアクター
Heddofon Akutaa
Headphone Actor
Game Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★☆
4
7
9
Reach Level 20
IA_Song_44.png
44.
仇返しシンドローム
Adagaeshi Shindoroumu
Revenge Syndrome
3D / Costume Change
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
4
6
9
Reach Level 20
IA_Song_45.png
45.
ワールド・コーリング
Warudo Kouringu
World Calling
Original Video
★★★☆☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
3
6
9
Reach Level 22
IA_Song_46.png
46.
塵塵呪詛
Chiri Chiri Juso
Dust Dust Curse
Game Video
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
4
6
9
Reach Level 22
IA_Song_47.png
47.
ロンリーチャイルド
Ronri Chairudo
Lonely Child
Original Video
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
4
6
9
Reach Level 22
IA_Song_48.png
48.
Circuit DISCO
Circuit DISCO
Circuit DISCO
3D / Costume Change
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
4
6
9
Reach Level 22
IA_Song_49.png
49.
東京リアルワールド
Tokyo Riaru Warudo
Tokyo Real World
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
Reach Level 24
IA_Song_50.png
50.
ロスタイムメモリー
Rosuto Taimu Memori
Lost Time Memory
Game Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
Reach Level 24
IA_Song_51.png
51.
夕暮れ蝉日記
Yuugure Semi Nikki
Dusk Cicada Diary
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
Reach Level 24
IA_Song_52.png
52.
偽りの決意
Itsuwari no Ketsui
False Determination
3D / Costume Change
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
Reach Level 24
IA_Song_53.png
53.
少女自傷癖
Shoujo Jishouheki
Self-Harming Girl
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
Reach Level 26
IA_Song_54.png
54.
現実的論理主義者
Genjitsuteki Ronri Shugisha
A Realistic Logical Ideologist
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
Reach Level 26
IA_Song_55.png
55.
セツナドライブ
Setsuna Doraibu
Setsuna Drive
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
Reach Level 26
IA_Song_56.png
56.
今日が雨の日じゃないとして
Kyou ga Ame no Hi Janai Toshite
As It's Not Raining Today
3D / Costume Change
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
Reach Level 26
IA_Song_57.png
57.
サマータイムレコード
Samaa Taimu Rekoudo
Summertime Record
3D / Costume Change
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★☆
4
7
9
Reach Level 30
IA_Song_58.png
58.
恋椿姫
Koi Tsubaki Hime
Camellia Princess' Love
Original Video
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
★★★★★★★★★★
5
8
10
Unlocked after the Credits
IA_Song_59.png
59.
絶境パラノイア
Zekkyou Paranoia
Remote Paranoia
Original Video
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
★★★★★★★★★★
5
8
10
Unlocked after the Credits
IA_Song_60.png
60.
横浜バトルライン
Yokohama Batoru Rain
Yokohama Battle Line
Original Video
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
★★★★★★★★★★
5
8
10
Unlocked after the Credits
DLC Songs


Japanese
Romaji
English
PV Type
Difficulty

Method To Obtain
IA_Song_DLC_01.png
01.
死神のギター
Shinigami no Gitaa
Death God's Guitar
3D / Costume Change
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
4
6
9
First Print Bonus
IA_Song_DLC_02.png
02.
ウラギリモジュール
Uragiri Mojuru
Betrayer Module
3D / Costume Change
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
First Print Bonus
IA_Song_DLC_03.png
03.
慟哭吸血鬼
Doukoku Kyuuketsuki
Wailing Vampire
3D / Costume Change
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
First Print Bonus
IA_Song_DLC_04.png
04.
サンデーミナミパーク
Sandei Minami Paaku
Sunday Minami Park
3D / Costume Change
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★☆☆
4
6
8
First Print Bonus
IA_Song_DLC_05.png
05.
プロムナード
Puromunaado
Promenade
3D / Costume Change
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
First Print Bonus
IA_Song_DLC_06.png
06.
夜咄ディセイブ
Yobanashi Diseibu
Night Tales Deceive
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
DLC Pack 1¹
Single -¥300²
IA_Song_DLC_07.png
07.
マジックアワー
Majikku Awaa
Magic Hour
Original Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
DLC Pack 1¹
Single -¥300²
IA_Song_DLC_08.png
08.
Shooting Star
Shooting Star
Shooting Star
Original Video
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
4
6
9
DLC Pack 1¹
Single -¥300²
IA_Song_DLC_09.png
09.
始まりの庭
Hajimari no Niwa
Garden of the Beginning
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★☆
4
7
9
DLC Pack 1¹
Single -¥300²
IA_Song_DLC_10.png
10.
憧憬 ~DOUKEI~
Doukei
Longing
Original Video
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
★★★★★★★★★★
5
8
10
DLC Pack 2¹
Single -¥300²
IA_Song_DLC_11.png
11.
オーバークロック
Oubaakurokku
Overclocking
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
DLC Pack 2¹
Single -¥300²
IA_Song_DLC_12.png
12.
君のとなりに
Kimi no Tonari ni
Next to You
??? Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
DLC Pack 2¹
Single -¥300²
IA_Song_DLC_13.png
13.
ヤクビョウガミ
Yakubyougami
Angel of Death
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★☆
4
7
9
DLC Pack 2¹
Single -¥300²
IA_Song_DLC_14.png
14.
ゲラゲラと笑うな
Geragera to Warau na
Don't Laugh with "hehe"
Original Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
DLC Pack 3¹
Single -¥300²
IA_Song_DLC_15.png
15.
泣き虫ピエロ
Nakimushi Piero
Crybaby Pierrot
Original Video
★★★★★☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★☆
5
7
9
DLC Pack 3¹
Single -¥300²
IA_Song_DLC_16.png
16.
サナトリウム
Sanatoriumu
Sanatorium
Original Video
★★★★☆☆☆☆☆☆
★★★★★★☆☆☆☆
★★★★★★★★★☆
4
6
9
DLC Pack 3¹
Single -¥300²
IA_Song_DLC_17.png
17.
Perverse Love Rock!
Perverse Love Rock!
Perverse Love Rock!
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
DLC Pack 3¹
Single -¥300²
IA_Song_DLC_18.png
18.
アフターグロウ
Afutagurou
Afterglow
Original Video
★★★☆☆☆☆☆☆☆
★★★★★☆☆☆☆☆
★★★★★★★★☆☆
3
5
8
¥300²
IA_Song_DLC_19.png
19.
I Want You
I Want You
I Want You
Game Video
★★★★★☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★☆
5
7
9
¥300²
Removed Songs


Japanese
Romaji
English
PV Type
Difficulty

Comment

01.
アウターサイエンス
Autā Saiensu
Outer Science
Unknown
Unknown
0
Has music file

02.
シンデレラデリバリィ
Shinderera Deribaryi
Cinderella Delivery
Unknown
Unknown
0
Has music file

03.
LIVEDRIVE
LIVEDRIVE
LIVEDRIVE
Unknown
Unknown
0
Has music file
IA_Removed_Song_01.png
04.
アメリカ~We are All Right!~
Amerika~We are All Right!~
America~We are All Right!~
Original Video
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
Has song image, some text, and is listed with the song list. This song was seen in early screenshots, gameplay, and trailers. It's also hard to say if this song was an original song or DLC because it's listed differently with the main game files and the DLC files. However, it does say it was meant for a DLC Pack 4.

05.
WORLD CALLING (TeddyLoid Remix)
WORLD CALLING (TeddyLoid Remix)
WORLD CALLING (TeddyLoid Remix)
Unknown
Unknown (maybe same as the used World Calling)
0
Has music file

06.
オツキミリサイタル
Otsukimi Risaitaru
Moon-Viewing Recital
Unknown
Unknown
0
Has music file

07.
REAL
REAL
REAL
Unknown
Unknown
0
Has music file

08.
DREAMER'S HIGH
DREAMER'S HIGH
DREAMER'S HIGH
Unknown
Unknown
0
Has music file

09.
sympa
sympa
sympa
Unknown
Unknown
0
Has music file

10.
HEVENRY PLAY!
HEVENRY PLAY!
HEVENRY PLAY!
Unknown
Unknown
0
Has music file

11.
サマークイーン
Samā Kuīn
Summer Queen
Unknown
Unknown
0
Has music file

12.
OVERTURE
OVERTURE
OVERTURE
Unknown
Unknown
0
Has music file

13.
軌跡に
Kiseki ni
On the Locus
Unknown
Unknown
0
Has music file
IA_Removed_Song_02.jpg
14.
SEE THE LIGHTS
SEE THE LIGHTS
SEE THE LIGHTS
Original Video
★★☆☆☆☆☆☆☆☆
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
2
4
7
This is in the song list's file, but most of it's info was removed, including the song name and producer. This was seen in very early screenshots.
IA_Removed_Song_03.png
15.
We gotta run
We gotta run
We gotta run
Original Video
★★★★☆☆☆☆☆☆
★★★★★★★☆☆☆
★★★★★★★★★★
4
7
10
Has a song image, some text, and is listed in the song list. This song was meant to be DLC in an unreleased DLC Pack 4. The pack is still listed with the DLC.

¹Most IA/VT -Colorful- song DLC is sold both individually for ¥300 per song or in a set of four for ¥1200. Each song includes one costume. Please visit the Costumes page for more information.
²A Japanese PSN account is required to obtain and use DLC for IA/VT Colorful. To switch PSN accounts on one PlayStation Vita, the system will have to be fully reset and formatted from the settings menu. Seeking out a guide on this process is recommended; performing the reset improperly can lead to data loss.