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Design Doc の書き方 / How to Write a Design Doc (Ja ver.)

Design Doc の書き方 / How to Write a Design Doc (Ja ver.)

「Design doc とは何か」・「何を書けばよいのか」を説明するスライドです。

関連するプレゼンテーション「読みやすいコードの書き方」: https://gist.github.com/munetoshi/65a1b563fb2c271f328c121a4ac63571

© 2023 Munetoshi Ishikawa, supported by LINE corporation

Munetoshi Ishikawa

May 11, 2023
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  1. Munetoshi Ishikawa
    Design Doc ͷॻ͖ํ

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  2. ͜ͷηογϣϯͷ஫ҙ఺
    Design doc ʹ͸༷ʑͳελΠϧ΍ํ๏࿦͕͋Δ

    - ͜ͷηογϣϯͰ঺հ͢Δ͜ͱ͸ 1 ྫʹա͗ͳ͍

    - ΧελϚΠζ͕ඞཁʹͳΔ͔΋


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  3. ιϑτ΢ΣΞ։ൃͰΑ͋͘Δ໰୊
    - ࣮૷ऴྃؒࡍʹઃܭ্ͷ໰୊͕ൃ֮

    → ΄΅࠷ॳ͔ΒίʔυΛॻ͖௚͠

    - ݸʑͷϓϧϦΫΤετ͸ LGTM

    → ίʔυશମͱͯͯ͠ҙຯෆ໌

    Design doc Λॻ͘͜ͱͰղܾͰ͖Δ͔΋

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  4. τϐοΫ
    - Design doc ͷ֓ཁ

    - Design doc ͷߏ੒

    - ӡ༻࣌ͷ஫ҙ఺

    - έʔεελσΟ

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  5. τϐοΫ
    - Design doc ͷ֓ཁ

    - Design doc ͷߏ੒

    - ӡ༻࣌ͷ஫ҙ఺

    - έʔεελσΟ

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  6. Design doc ͷ֓ཁ
    - Design doc ͱ͸

    - ʮԿΛʯॻ͔͘

    - ʮ͍ͭʯॻ͔͘

    - ৄࡉઃܭॻͱͷҧ͍

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  7. Design doc ͷ֓ཁ
    - Design doc ͱ͸

    - ʮԿΛʯॻ͔͘

    - ʮ͍ͭʯॻ͔͘

    - ৄࡉઃܭॻͱͷҧ͍

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  8. Design doc ͱ͸ 1/2
    ιϑτ΢ΣΞઃܭॻͷҰछ

    - ʮͲ͏࣮૷͢Δ͔ʯ͕য఺

    - ։ൃऀʹΑͬͯॻ͔ΕΔ

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  9. Design doc ͱ͸ 2/2
    ࣮૷Λߦ͏લʹॻ͘υΩϡϝϯτ

    - ࣮૷લʹઃܭʹ͍ͭͯٞ࿦

    - ࣮૷த΋ΞοϓσʔτՄ

    design doc ࣮૷
    “Twemoji” ©Twitter, Inc and other contributors (Licensed under CC-BY 4.0) https://twemoji.twitter.com/

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  10. Design doc ͷར఺
    ੜ࢈ੑɾϓϩδΣΫτͷ੒ޭ཰ͷ޲্

    - ϑΟʔυόοΫαΠΫϧͷ୹ظؒԽ

    - ࣮૷લͷ໰୊఺ͷચ͍ग़͠

    - ίετݟੵ΋Γͷώϯτ

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  11. Design doc ͷ֓ཁ
    - Design doc ͱ͸

    - ʮԿΛʯॻ͔͘

    - ʮ͍ͭʯॻ͔͘

    - ৄࡉઃܭॻͱͷҧ͍

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  12. Design doc ͷয఺
    ʮͲ͏࣮૷͢Δ͔ʯʹয఺Λ౰ͯΔ

    - ໰୊఺ͱղܾࡦͷ໌֬Խ

    - νʔϜϝϯόʔͱͷٞ࿦

    - ίϯςΩετʢഎܠ΍ܦҢʣͷه࿥

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  13. ؔ࿈͢ΔιϦϡʔγϣϯ 1/2
    Կɾͳͥ: ࢓༷ɾ໨తͷ໌֬Խ

    - PRD (Product Requirements Document)

    ͩΕɾ͍ͭ: λεΫɾϚΠϧετʔϯ؅ཧ

    - Πγϡʔ؅ཧπʔϧɾϓϩδΣΫτ؅ཧπʔϧ


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  14. ؔ࿈͢ΔιϦϡʔγϣϯ 2/2
    ৽ϝϯόʔ޲͚ࢿྉɾݱঢ়આ໌

    - νϡʔτϦΞϧɾελʔτΨΠυɾΞʔΩςΫνϟจॻ

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  15. Design doc ͷϖʔδ਺
    ௕ͯ͘΋े਺ϖʔδఔ౓

    - ୹ͯ͘ࡁΉͳΒͦΕʹӽͨ͜͠ͱ͸ͳ͍

    - 20 ϖʔδҎ্ͷ৔߹ → λεΫɾϓϩδΣΫτΛ෼ׂ͢Δ

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  16. Design doc ͷ֓ཁ
    - Design doc ͱ͸

    - ʮԿΛʯॻ͔͘

    - ʮ͍ͭʯॻ͔͘

    - ৄࡉઃܭॻͱͷҧ͍

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  17. ͍ͭ design doc Λॻ͘΂͖͔
    ʮԿΛ͢Δ͔ʯ͕͋Δఔ౓ܾ·͔ͬͯΒɺ࣮૷Λ։࢝͢Δલ

    த௕ظతͳϓϩδΣΫτɾλεΫʹ͍ͭͯॻ͘

    - υΩϡϝϯτ࡞੒ࣗମ΋Φʔόʔϔου

    = ؆୯ͳ 1 ߦͷόάमਖ਼Ͱ͸ॻ͔ͳ͍

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  18. ͍ͭ design doc Λॻ͘΂͖͔ (cont.)
    Design doc Λॻ͘ج४ͷྫ:

    - 2 िؒҎ্͔͔ΔλεΫ

    - ෳ਺ͷϦϦʔεʹ·͕ͨΔϓϩδΣΫτ

    - ଟ਺ͷϞδϡʔϧɾΫϥεʹӨڹ͢Δमਖ਼

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  19. Design doc ͷ֓ཁ
    - Design doc ͱ͸

    - ʮԿΛʯॻ͔͘

    - ʮ͍ͭʯॻ͔͘

    - ৄࡉઃܭॻͱͷҧ͍

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  20. ΢ΥʔλʔϑΥʔϧͱͷൺֱ: ڞ௨఺
    τοϓμ΢ϯͳΞϓϩʔν

    - ࣮૷ͷલʹઃܭ

    - จॻͷϨϏϡʔɾٞ࿦
    design doc ࣮૷
    +
    ϨϏϡʔɾٞ࿦
    “Twemoji” ©Twitter, Inc and other contributors (Licensed under CC-BY 4.0) https://twemoji.twitter.com/

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  21. ࣮૷ͱͷڥք͕ݫ֨Ͱ͸ͳ͍

    - ࣮૷୲౰ऀɾνʔϜʹΑͬͯॻ͔ΕΔ

    - ׬ᘳͳৄࡉ͸ٻΊͳ͍: ੩తݕূͷলུɾ։ൃதͷΞοϓσʔτ

    - ΞδϟΠϧ։ൃʹ΋ద༻Մೳ
    ΢ΥʔλʔϑΥʔϧͱͷൺֱ: ૬ҧ఺
    design doc ࣮૷
    ୲౰ऀ
    “Twemoji” ©Twitter, Inc and other contributors (Licensed under CC-BY 4.0) https://twemoji.twitter.com/

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  22. Design doc ͷ֓ཁ: ·ͱΊ
    - Design doc ͸ιϑτ΢ΣΞઃܭॻͷҰछ

    - ʮͲ͏ʯ࣮૷͢Δ͔ʹয఺Λ͋ͯΔ

    - தɾେن໛ͳ࣮૷Λ࢝ΊΔલʹॻ͘

    - ࣮૷தʹߋ৽͠ಘΔ

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  23. τϐοΫ
    - Design doc ͷ֓ཁ

    - Design doc ͷߏ੒

    - ӡ༻࣌ͷ஫ҙ఺

    - έʔεελσΟ

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  24. Design doc ͷϑΥʔϚοτ
    ߲໨ʹରͯ͠ʮݫີͳʯϑΥʔϚοτ͸ͳ͍͜ͱ͕ଟ͍

    - ඞཁे෼ͳ߲໨ͰηΫγϣϯΛߏ੒͢Δ

    - ʮϑΥʔϚοτΛຒΊΔ͜ͱʯΛ໨తԽ͠ͳ͍

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  25. యܕతͳ design doc ͷߏ੒
    - ໨తɾΰʔϧʢ΄΅ඞਢʣ

    - എܠ

    - ઃܭͷ֓ཁ

    - ৄࡉઃܭ

    - ͦͷଞͷؔ৺ࣄ

    τοϓμ΢ϯʹཧղͰ͖Δߏ੒ʹ͢Δ

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  26. యܕతͳ design doc ͷߏ੒
    - ໨తɾΰʔϧʢ΄΅ඞਢʣ

    - എܠ

    - ઃܭͷ֓ཁ

    - ৄࡉઃܭ

    - ͦͷଞͷؔ৺ࣄ

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  27. ໨తɾΰʔϧ
    ਺จͰʮԿΛ࣮ݱ͢Δͷ͔ʯΛఆٛ͢Δ

    - ʮ…ػೳΛ࣮૷͢ΔͨΊͷɺσʔλετΞͱͦͷϞσϧΛ࣮૷͢Δʯ

    - ʮ…ΛϓϩμΫτ಺Ͱར༻Մೳʹ͢ΔϥΠϒϥϦΛ࡞੒͢Δʯ

    - ʮ…ΛϦϑΝΫλ͠ɺ…ͷػೳ௥ՃΛ༰қʹ͢Δʯ

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  28. ໨తɾΰʔϧ: ஫ҙ఺
    ௕͘ॻ͖͗͢ͳ͍

    - ඞཁͳΒ͹ PRD Λผ్༻ҙ

    - ʮ࣮૷͢ΔՁ஋͕͋Δ͔ʯ΋جຊతʹ͸ PRD Ͱٞ࿦

    είʔϓΛ໌֬ʹ͢Δ

    - ඞཁʹԠͯ͡ʮout of scopeʯ΍ʮࠓޙͷ༧ఆʯΛ໌ه

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  29. యܕతͳ design doc ͷߏ੒
    - ໨తɾΰʔϧʢ΄΅ඞਢʣ

    - എܠ

    - ઃܭͷ֓ཁ

    - ৄࡉઃܭ

    - ͦͷଞͷؔ৺ࣄ

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  30. എܠ
    ਺ஈམҎ಺Ͱ࣮૷͢Δཧ༝ɾલఏ஌ࣝɾ੍໿Λઆ໌

    - ͜ͷ࣮૷ɾϦϑΝΫλϦϯά͕ඞཁͳཧ༝ɾར఺

    - ༻ޠɾٕज़తഎܠ

    - ༏ઌ͢΂͖߲໨: ֦ுੑɾؤ݈ੑɾੑೳ…

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  31. എܠ: ஫ҙ఺
    ௕͘ॻ͖͗͢ͳ͍

    - ؔ࿈จॻʢPRDɾଞͷ design docʣ౳ͷϦϯΫΛར༻

    ໨తɾΰʔϧͷޙʹॻ͘

    - ʮԿʹ͍ͭͯ࿩͍ͯ͠Δ͔ʯΛઌʹཧղͤ͞Δ

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  32. എܠ: ஫ҙ఺ (cont.)
    ૝ఆಡऀΛҙࣝ͢Δ

    - ͦͷػೳɾϓϩμΫτʹؔΘ͍ͬͯͳ͍ਓ΋ର৅͔
    ͦͷػೳͷ։ൃऀ
    ͦͷϓϩμΫτͷ։ൃऀ
    ಉ͡୲౰ྖҬ৬छͷ։ൃऀ
    “Twemoji” ©Twitter, Inc and other contributors (Licensed under CC-BY 4.0) https://twemoji.twitter.com/

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  33. యܕతͳ design doc ͷߏ੒
    - ໨తɾΰʔϧʢ΄΅ඞਢʣ

    - എܠ

    - ઃܭͷ֓ཁ

    - ৄࡉઃܭ

    - ͦͷଞͷؔ৺ࣄ

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  34. ઃܭͷ֓ཁ
    ઃܭͷॏཁͳ෦෼ʹ͍ͭͯॻ͘ɾඳ͘

    - ࣮૷ͷجຊతͳΞΠσΟΞ

    - ؆ུԽͨ͠ΫϥεਤɾϞδϡʔϧߏ੒ਤ

    - ॏཁͳཁૉͷྻڍͱઆ໌

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  35. ઃܭͷ֓ཁ: جຊతͳΞΠσΟΞ
    ࣮૷ࠔ೉ͳ఺ɾؾΛ͚ͭΔ΂͖఺ͷղܾ๏Λࣔ͢

    - ʮ…͕ະ஌Ͱ͋ΔͨΊɺαΠζՄมͳ LRU ΩϟογϡΛ࢖͏ʯ

    - ʮ…ͷ॥؀ґଘͷղܾʹ SeviceLocator Λ࢖͏ʯ

    - ʮ…ͷಠཱੑͷ֬อͷͨΊʹ Layer A ͱ B Λ෼཭͢Δʯ

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  36. ઃܭͷ֓ཁ: ؆ུԽͨ͠Ϋϥεਤ
    ॏཁͳΫϥεɾϞδϡʔϧͱͦͷؔ܎ੑΛࣔ͢

    - खඳ͖ɾ؆ུԽͨ͠ϑΥʔϚοτ΋Մ

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  37. ઃܭͷ֓ཁ: ஫ҙ఺
    ࡉ͔͘ॻ͖͗͢ͳ͍

    - ॏཁͰͳ͍ཁૉΛؒҾ͘

    - ಛʹ஫ҙ͢Δ΂͖͜ͱʹয఺Λ౰ͯΔ
    ؆ུԽ

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  38. యܕతͳ design doc ͷߏ੒
    - ໨తɾΰʔϧʢ΄΅ඞਢʣ

    - എܠ

    - ઃܭͷ֓ཁ

    - ৄࡉઃܭ

    - ͦͷଞͷؔ৺ࣄ

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  39. ৄࡉઃܭ
    ʮઃܭͷ֓ཁʯΛΑΓৄࡉʹॻ͘ɾඳ͘

    ཁૉ͝ͱɾݟΔ֯౓͝ͱʹηΫγϣϯΛ࡞Δ

    - ཁૉ͝ͱ: ϞδϡʔϧɾΫϥεɾίϯϙʔωϯτɾϨΠϠ

    - ݟΔ֯౓͝ͱ: ঢ়گ΍৚݅ɾλΠϜϥΠϯɾAPI

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  40. ৄࡉઃܭ: ߲໨ྫ
    - Ϟδϡʔϧ͝ͱͷ֓ཁઆ໌ɾΫϥεਤ

    - ϞσϧΫϥεɾσʔλߏ଄ͷҰཡ

    - API ͷϦετɾ࢖༻ྫͷίʔυ

    - యܕతͳσʔλϑϩʔɾγʔΫΤϯεਤ

    - ٖࣅίʔυ

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  41. యܕతͳ design doc ͷߏ੒
    - ໨తɾΰʔϧʢ΄΅ඞਢʣ

    - എܠ

    - ઃܭͷ֓ཁ

    - ৄࡉઃܭ

    - ͦͷଞͷؔ৺ࣄ

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  42. ͦͷଞͷؔ৺ࣄ
    ϓϩδΣΫτͷਐΊํɾӨڹൣғɾ஫ҙ఺౳ʹؔ͢Δิ଍

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  43. ͦͷଞͷؔ৺ࣄ
    ϓϩδΣΫτͷਐΊํɾӨڹൣғɾ஫ҙ఺౳ʹؔ͢Δิ଍

    - ୲౰ऀ

    - େ·͔ͳλεΫͷखॱ

    - ϦϦʔεɾϞχλϦϯάϓϥϯ

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  44. ͦͷଞͷؔ৺ࣄ
    ϓϩδΣΫτͷਐΊํɾӨڹൣғɾ஫ҙ఺౳ʹؔ͢Δิ଍

    - ະղܾͷ໰୊ɾ੍ݶ

    - ଞʹӨڹΛड͚ΔϞδϡʔϧ

    - ηΩϡϦςΟɾϓϥΠόγʔɾύϑΥʔϚϯε

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  45. యܕతͳ design doc ͷߏ੒
    - ໨తɾΰʔϧʢ΄΅ඞਢʣ

    - എܠ

    - ઃܭͷ֓ཁ

    - ৄࡉઃܭ

    - ͦͷଞͷؔ৺ࣄ

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  46. Design doc ͷߏ੒: ·ͱΊ
    ඞཁे෼ͳ߲໨Ͱߏ੒͢Δ

    - ʮ໨తɾΰʔϧʯ͸΄΅ඞਢ

    - ֎෦ͷυΩϡϝϯτͳͲ΋ར༻

    τοϓμ΢ϯʹཧղͰ͖Δߏ੒ʹ͢Δ

    - ໨త → എܠ

    - ઃܭͷ֓ཁ → ৄࡉઃܭ

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  47. τϐοΫ
    - Design doc ͷ֓ཁ

    - Design doc ͷߏ੒

    - ӡ༻࣌ͷ஫ҙ఺

    - έʔεελσΟ

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  48. Ξϯνύλʔϯ 1
    1. ʮ׬ᘳͳʯ design doc Λॻ্͖͛Δ

    2. ϨϏϡʔͷϛʔςΟϯάʹ 10 ਓҎ্ট଴

    3. ٞ࿦தʹઃܭͷ໰୊͕ൃ֮

    4. ࠷ॳ͔Β design doc Λॻ͖௚͢

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  49. ٞ࿦ͷλΠϛϯά
    ٞ࿦ͱ design doc ࡞੒Λަޓʹߦ͏

    ࠷ॳͷٞ࿦͸…

    - ʮগਓ਺Ͱʯ: ςοΫϦʔυͱͷ 1-on-1 ͔Β࢝Ίͯ΋Α͍

    - ʮղܾҊ͕ͳͯ͘΋ʯ: ٞ࿦ͰղܾҊΛݟ͚ͭΕ͹Α͍

    - ʮ΄΅നࢴͰ΋ʯ: ٞࣄ࿥తʹ design doc Λॻ͘͜ͱ͕Ͱ͖Δ

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  50. Ξϯνύλʔϯ 2
    1. Design doc ͷ࡞੒ɾϨϏϡʔ͕׬ྃ

    2. ࣮૷Λ։࢝

    3. ࣮૷தʹઃܭͷ໰୊͕ൃ֮

    4. ઃܭΛมߋ͠ͳ͍Α͏ʹ ͦͷ৔͠ͷ͗ͷղܾࡦΛ࠾༻

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  51. Design doc ߋ৽ͷλΠϛϯά
    ࣮૷தʹ΋ઃܭΛมߋͯ͠΋Α͍

    ୹͍αΠΫϧͰʮͲ͏ղܾ͢Δ͔ʯΛٞ࿦͢Δ

    - ඞཁͳΒ͹ design doc Λߋ৽͢Δ

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  52. Ξϯνύλʔϯ 3
    1. ઃܭมߋͷ౓ʹ design doc Λߋ৽

    2. ʮελʔτΞοϓΨΠυʯͱ͠΋࠶ར༻

    3. ଟେͳίετ͕ඞཁʹͳΔ

    - ৽نϝϯόʔ͸େྔͷ design doc ΛಡΉඞཁ͕͋Δ

    - ܰඍͳมߋͰ΋େྔͷ design doc ͷߋ৽͕ඞཁʹͳΔ

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  53. Design doc ͷ੹೚ൣғ
    Design doc ͸جຊతʹ͸࢖͍ࣺͯ

    - 1 ϓϩδΣΫτͰ 1 design doc

    - ΞʔΧΠϒ΍ʮܦҢΛ஌Δख͕͔Γʯʹ͸ͳΔ

    - ଞͷબ୒ࢶΛߟྀ: ΞʔΩςΫνϟจॻɾPRDɾνϡʔτϦΞϧ

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  54. Ξϯνύλʔϯ 4
    1. ػೳ։ൃͷϓϩδΣΫτ͕׬ྃ

    2. …਺Χ݄ޙ…

    3. ػೳ௥ՃͷϓϩδΣΫτ͕ൃ଍

    4. Ҏલͷ design doc ͕୳ͤͳ͍

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  55. Design doc ͷτϨʔαϏϦςΟ
    Design doc ͷϦϯΫΛ׆༻

    - ϓϧϦΫΤετ͔ΒࢀরՄೳʹ

    - Πγϡʔνέοτ͔ΒࢀরՄೳʹ

    Design doc ͷϦετΛ࡞Δ

    - ख࡞ۀͰ؅ཧ͢ΔΑΓ΋࢓૊ΈͰ؅ཧ

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  56. ӡ༻࣌ͷ஫ҙ఺: ·ͱΊ
    - ٞ࿦ɾϨϏϡʔͷαΠΫϧ͸୹Ίʹ

    - ࣮૷தʹ΋ design doc ͸ߋ৽Մ

    - Design doc ʹʮଞͷ໾ׂʯΛ௥Ճ͠ͳ͍

    - ޙ͔Β design doc ΛࢀরͰ͖ΔΑ͏ʹ

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  57. τϐοΫ
    - Design doc ͷ֓ཁ

    - Design doc ͷߏ੒

    - ӡ༻࣌ͷ஫ҙ఺

    - έʔεελσΟ

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  58. έʔεελσΟ
    ʮઃఆը໘ʯͷϦϑΝΫλϦϯάͷґཔ
    ௨஌
    ը࣭ઃఆ
    Ξχϝʔγϣϯ
    << Φϯ >>
    << ߴը࣭ >>
    << ϑϧ >>

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  59. ґཔ࣌ͷϛʔςΟϯά
    ґཔΛड͚Δ࣌఺Ͱ໨త΍എܠΛ໌֬ʹ͢Δ

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  60. ϦϑΝΫλϦϯάର৅ͷௐࠪ
    ݱࡏͷঢ়ଶΛ೺Ѳɾ໰୊఺ͷચ͍ग़͠

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  61. ϦϑΝΫλϦϯάର৅ͷௐࠪ (cont.)
    ݱࡏͷঢ়ଶΛ೺Ѳɾ໰୊఺ͷચ͍ग़͠

    - ໨తɾഎܠΛ۩ମԽ͢Δ

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  62. ઃܭํ਑ͷٞ࿦
    ςοΫϦʔυͱͷ 1-on-1 ͳͲͰઃܭҊΛٞ࿦͢Δ

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  63. ௥Ճɾߋ৽ඞཁͳ߲໨ 1/2
    ໨తɾഎܠ

    - ઃܭҊΛݩʹ۩ମԽ

    λεΫϓϥϯ

    - ͲͷॱͰ࣮૷͢Δ͔

    - ϦϑΝΫλϦϯάதʹ௥Ճ͞Ε߲ͨ໨ͷऔΓѻ͍

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  64. ௥Ճɾߋ৽ඞཁͳ߲໨ 2/2
    ςετ

    - ϢχοτςετͰݕূ͢Δ಺༰

    - ϦάϨογϣϯςετͷํ๏

    ߲໨௥Ճ࣌ͷखॱ

    - αϯϓϧίʔυ

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  65. έʔεελσΟ: ·ͱΊ
    ٞ࿦ͷ͍ͭͰʹॻ͘ͱָ

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  66. ·ͱΊ
    Design doc: ιϑτ΢ΣΞઃܭॻͷҰछ

    - υΩϡϝϯτͷ੹೚ൣғΛ໌֬ʹ

    - ඞཁͳ߲໨Λඞཁͳ͚ͩॻ͘

    - ୹͍αΠΫϧ͕ॏཁ

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  67. Appendix 1: πʔϧ
    ڞಉฤूɾཤྺɾίϝϯτ΍ϨϏϡʔ͕Ͱ͖Ε͹ԿͰ΋ྑ͍

    - Atlassian confluence, Notion

    - GitHub Gist, markdown in repository

    - Google docs, Dropbox Paper, Box notes

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  68. Appendix 2: Design doc ͷྫ
    Chromium design docs

    - https://www.chromium.org/developers/design-documents

    Bazel design docs

    - https://github.com/bazelbuild/proposals

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