質とスピード（2020秋100分拡大版） / Quality and Speed 2020 Autumn Edition

࣭ͱεϐʔυ ࿨ా୎ਓ !U@XBEB ʙιϑτ΢ΣΞ։ൃͷయܕతͳޡղΛղ͘ʙ /PW !+B445,ZVTIVجௐߨԋ ʢळόʔδϣϯʣ

t-wada t_wada twada #jasstkyushu ࣗݾ঺հ

t-wada t_wada twada #jasstkyushu ࣗݾ঺հ illustrated by @mty_mno

ٕज़ॻͷग़൛ʹؔΘ͍ͬͯ·͢

ΑΖ͓͘͠ئ͍͠·͢ #jasstkyushu illustrated by @mty_mno

ߥͿΔ࢛ఱԦ͕͋ΒΘΕͨʂ ༩͑ΒΕͨ࣌ؒʹରͯ͠΍Δ΂͖͜ͱ͕ଟ͗͢Δ৔߹ɺͲ͏͢΂͖͔ B είʔϓΛ࡟Δ C ΋ͬͱਓΛ૿΍͢ D ϦϦʔε೔ΛԆظ͢Δ E
඼࣭Λ٘ਜ਼ʹ͢Δ ʰΞδϟΠϧαϜϥΠʱQ

w୹ظతʹ͸ಘΒΕΔ wதظతʹ͸ٯޮՌʹͳΔ w௕ظతʹ͸க໋ইʹͳΔ ඼࣭Λ٘ਜ਼ʹ͢Ε͹εϐʔυ͸ಘΒΕΔʁ

ʮ୹ظతதظతʯͷڥ໨͸ʁ ͜͜Ͱ͍͏ʮ඼࣭ʯͱ͸ʁ

l඼࣭ͱ͸୭͔ʹͱͬ ͯͷՁ஋Ͱ͋Δz (FSBME8FJOCFSH IUUQTXXXBNB[PODPKQEQ9

Accessibility Adaptability Administrability Analyzability Auditability Availability Calibrability Changeability Compatibility Configurability
Exploitability Extensibility Flexibility Functionality Installability Integrability Internationalizab ility Interoperability Learnability Maintainability Marketability Maturity Modifiability Operability Personalizability Portability Recoverability Reliability Replaceability Reusability Scalability Security Sensitivity Stability Suitability Supportability Testability Traceability Transactionality Understandability Upgradeability Usability ... and lots more! JMJUJFT

IUUQTXXXKVTFPSKQEFQBSUNFOUBMQPJOUIUNM ङ໺Ϟσϧ

ʢ͓٬༷͔Βʣݟ͑Δ඼࣭ͱݟ͑ͳ͍඼࣭ w֎෦඼࣭ͱ಺෦඼࣭ wར༻࣌ͷ඼࣭ͱ੡඼඼࣭ wػೳཁ݅ͱඇػೳཁ݅

External Quality: Correctness, Usability, Efficiency, Reliability, Integrity, Adaptability, Accuracy, Robustness
Internal Quality: Maintainability, Flexibility, Portability, Re-usability, Readability, Testability, Understandability ֎෦඼࣭ͱ಺෦඼࣭

ιϑτ΢ΣΞͷ඼࣭Λ֎෦ࢦඪͰಛ௃͚ͮΔਓ͸ଟ͍ɻਖ਼͍͜͠ͱΛ͢ Δɺόά͕ͳ͍ɺ଎͍ɺͳͲͩɻ͕ͩɺͦΕΒ͸ΑΓਂ͍ݪҼͷ঱ঢ়ʹ ͗͢ͳ͍ɻ ຊॻͰઆ໌͢Διϑτ΢ΣΞͷ඼࣭͸಺෦඼࣭Ͱ͋Δɻ಺෦඼࣭Λ࡞Γ ࠐΜͩ݁Ռͱͯ͠ɺ֎෦඼࣭ͱͯ͠ఆٛ͞ΕΔಛੑͷ࣮ݱʹۙͮ͘͜ͱ ͕Ͱ͖Δɻ಺෦඼࣭͸݁ՌͰ͸ͳ͘ݪҼͰ͋Γɺྑ͍ιϑτ΢ΣΞ͕උ ͍͑ͯΔ΂͖΋ͷͩɻ ʰϨΨγʔίʔυ͔Βͷ୤٫ʱQ

Internal Quality: Maintainability, Flexibility, Portability, Re-usability, Readability, Testability, Understandability ಺෦඼࣭ʢ*OUFSOBM2VBMJUZʣ ࣗ෼ͨͪͷࣹఔ಺ʹ͋Δ ಺෦඼࣭ͷํΛ٘ਜ਼ʹ͢Δͱ͍͏ ൑அΛ͕ͪ͠ͳͷͰ͸ͳ͍͔

࿨ా୎ਓ !U@XBEB ࣭ͱεϐʔυ ʙιϑτ΢ΣΞ։ൃͷయܕతͳޡղΛղ͘ʙ

࿨ా୎ਓ !U@XBEB ಺෦඼࣭ͱεϐʔυ ʙιϑτ΢ΣΞ։ൃͷయܕతͳޡղΛղ͘ʙ

Ͱ͸ͲͷΑ͏ͳ ɹ಺෦඼࣭Λ ٘ਜ਼ʹ๋͛ͨͷ͔

Internal Quality: Maintainability, Flexibility, Portability, Re-usability, Readability, Testability, Understandability ಺෦඼࣭ʢ*OUFSOBM2VBMJUZʣ

Internal Quality: Maintainability, Flexibility, Portability, Re-usability, Readability, Testability, Understandability อकੑʢ.BJOUBJOBCJMJUZʣ

อकੑ Maintainability

#PFIN #SPXO BOE-JQPXT2VBMJUZ$IBSBDUFSJTUJDT IUUQTXXXUIPNBTBMTQBVHIPSHQVCGOEJMJUZIUNM

.BJOUBJOBCJMJUZʢอकੑʣΛߏ੒͢Δ΋ͷ w5FTUBCJMJUZςετ༰қੑ w6OEFSTUBOEBCJMJUZཧղ༰қੑ w.PEJpBCJMJUZมߋ༰қੑ

w ࣮ߦԁ׈ੑʢ0QFSBCJMJUZʣ w ࣗಈ࣮ߦ͕༰қͰ͔ͭߴ଎ w ؍ଌ༰қੑʢ0CTFSWBCJMJUZʣ w ςετ݁Ռͷऔಘɾظ଴஋ൺֱΛࣗಈԽ͠΍͍͢ w ੍ޚ༰қੑʢ$POUSPMMBCJMJUZʣ
w ࣄલঢ়ଶΛ੍ޚ͠ɺςετର৅Λࣗಈૢ࡞͠΍͍͢ w ෼ղՄೳੑʢ%FDPNQPTBCJMJUZʣ w ςετର৅ͷ੾Γग़͠ɺςετ؀ڥ΁ͷ෦෼ஔ׵͕༰қ IUUQTTQFBLFSEFDLDPNHPZPLJUFTUBCJMJUZJOFNCFEEFETPGUXBSF ࣗಈςετʹ͓͚ΔςελϏϦςΟ

࿨ా୎ਓ !U@XBEB ಺෦඼࣭ͱεϐʔυ ʙιϑτ΢ΣΞ։ൃͷయܕతͳޡղΛղ͘ʙ

࿨ా୎ਓ !U@XBEB อकੑͱεϐʔυ ʙιϑτ΢ΣΞ։ൃͷయܕతͳޡղΛղ͘ʙ

อकੑΛ ٘ਜ਼ʹ๋͛Δͱ Ͳ͏ͳΔ͔

ʮ͋ͱͰΫϦʔϯʹ͢Ε͹͍͍Αɻઌʹࢢ৔ʹग़͞ͳ͚Ε͹ʂʯ ։ൃऀ͸ͦ͏΍͍ͬͯͭ΋͝·͔͢ɻ͕ͩɺ͋ͱͰΫϦʔϯʹ͢Δ͜ͱ͸ͳ ͍ɻࢢ৔͔ΒͷϓϨογϟʔ͸ࢭ·Βͳ͍͔Βͩɻʮઌʹࢢ৔ʹग़͞ͳ͚ Ε͹ʯͱ͍͏͜ͱ͸ɺޙΖʹڝ߹ଞ͕ࣾେ੎͍Δͱ͍͏͜ͱͰ͋Δɻڝ߹ ଞࣾʹ௥͍ൈ͔Εͳ͍ͨΊʹ͸ɺ͜Ε͔Β΋૸Γଓ͚Δ͔͠ͳ͍ɻ ͦͷ݁Ռɺ։ൃऀ͸ϞʔυΛ੾Γସ͑Δ͜ͱ͕Ͱ͖ͳ͍ɻ࣍ͷػೳɺ·ͨ ࣍ͷػೳɺ·ͨ·ͨ࣍ͷػೳΛ௥Ճ͢Δ͜ͱʹͳΓɺίʔυΛΫϦʔϯʹ ͢Δ͜ͱ·Ͱख͕ճΒͳ͍ɻ ͦͯ͠ɺ่յ͕࢝·Δɻੜ࢈ੑ͕θϩʹ͍͍ۙͮͯ͘ɻ ʰ$MFBO"SDIJUFDUVSFʱQ

IUUQTUXJUUFSDPNOFLPZBTUBUVT

IUUQTNBSUJOGPXMFSDPNBSUJDMFTJTRVBMJUZXPSUIDPTUIUNM อकੑͷ௿͕͞΋ͨΒ͢΋ͷ ͻͱͭͻͱͭͷมߋʹ ༨ܭͳ͕͔͔࣌ؒΔ

อकੑΛ٘ਜ਼ʹ͢Ε͹εϐʔυ͸ಘΒΕΔʁ w୹ظతʹ͸ಘΒΕΔ wதظతʹ͸ٯޮՌʹͳΔ w௕ظతʹ͸க໋ইʹͳΔ

Ͱ͸ εϐʔυΛམͱͤ͹ อकੑ͸্͕Δʁ

IUUQTUXJUUFSDPNWPMVOUBTTUBUVT

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ܦӦతͳཁٻʹ߹Θͤͯɺ༩͑ΒΕͨ։ൃظ͔ؒΒॊೈʹԚ͞ͱ଎͞Λબ୒͢Δͱ͍͏Α͏ ͳث༻ͳܳ౰͸΄ͱΜͲෆՄೳͩͱ͍͑·͢ɻ͜Ε͸ɺۃΊͯجૅతͳͱ͜ΖͰ͋Ε͹ଟগ ͸Ͱ͖Δ͔΋͠Ε·ͤΜ͕ɺ࣮ࡍʹ͸ɺιʔείʔυ͕Ԛͯ͘஗͍ਓ΋͍Ε͹ɺ៉ྷͰ଎͍ ਓ΋ଟ͍͘·͢ɻ ʰΤϯδχΞϦϯά૊৫࿦΁ͷট଴ʱQ ΫΠοΫμʔςΟͷਆ࿩

ͭ·Γ τϨʔυΦϑͰ͸ͳ͍

IUUQTUXJUUFSDPNLBU[DIBOHTUBUVT

࣭ อकੑ εϐʔυ τϨʔυΦϑͱߟ͑Δͷ͸యܕతͳޡղ നؙ෇͖໼ҹෛͷ઀ଓࠜݩ͕૿͑Ε͹ઌ͸ݮΔɻࠜݩ͕ݮΕ͹ઌ͸૿͑Δ

඼࣭Λ٘ਜ਼ʹ͢Δͷ͸ɺޮՌతͳίϯτϩʔϧํ๏Ͱ͸ͳ͍ɻ඼࣭ ͸੍ޚม਺Ͱ͸ͳ͍ɻ ௿඼࣭Λड͚ೖΕΔ͜ͱͰɺϓϩδΣΫτ͕଎͘ͳΔ͜ͱ͸ͳ͍ɻ ߴ඼࣭Λཁٻ͢Δ͜ͱͰɺϓϩδΣΫτ͕஗͘ͳΔ͜ͱ΋ͳ͍ɻ Ή͠Ζ඼࣭ΛߴΊΔ͜ͱͰɺσϦόϦʔ͕ߴ଎ʹͳΔ͜ͱ͕ଟ͍ɻ ඼࣭ج४ΛԼ͛ͯ͠·͏ͱɺσϦόϦʔ͕஗͘ͳΓɺ ༧ଌͰ͖ͳ͘ͳͬͯ͠·͏ɻ ʰΤΫετϦʔϜϓϩάϥϛϯάʱQ

ઌ΄Ͳͷ։ൃऀͷ͝·͔͠͸ɺ่յͨ͠ίʔυΛॻ͚͹௕ظతʹ͸஗͘ͳ Δ΋ͷͷɺ୹ظతʹ͸଎౓্͕͕Δͱ͍͏ߟ͑ํʹ΋ͱ͍͍ͮͯΔɻ ͜ͷ͜ͱΛ৴͍ͯ͡Δ։ൃऀ͸ɺ่յͨ͠ίʔυΛॻ͘Ϟʔυ͔Βɺ ͍ͣΕͲ͔͜ͰΫϦʔϯʹ͢ΔϞʔυʹ੾ΓସΘΕΔɺͱ͍͏ ʢ΢αΪͱΧϝͷʣ΢αΪͷΑ͏ͳࣗ৴Λ͍࣋ͬͯΔɻ ͕ͩɺͦΕ͸ࣄ࣮ޡೝͰ͋Δɻ ࣄ࣮͸ɺ୹ظతʹ΋௕ظతʹ΋ɺ่յͨ͠ίʔυΛॻ͘΄͏͕ ΫϦʔϯͳίʔυΛॻ͘ΑΓ΋ৗʹ஗͍ɻ ʰ$MFBO"SDIJUFDUVSFʱQQ

୹ظతʹ΋௕ظతʹ΋ɺ ่յͨ͠ίʔυΛॻ͘΄͏͕ ΫϦʔϯͳίʔυΛॻ͘ΑΓ΋ ৗʹ஗͍ɻ #PC.BSUJO ʰ$MFBO"SDIJUFDUVSFʱQ

࠷ߴͷ։ൃऀ͕͍ͪ͹Μ͖Ε͍޷͖ͳ։ൃऀͰ͋Δ͜ͱʹؾͮ ͍ͨͱ͖ɺࢲ͸ͼͬ͘Γͨ͠ɻ଎͍ϓϩάϥϚʔ͸ࡶͳϓϩά ϥϚʔͩͱࢥ͍͔ͬͯͨΒͩɻ ͕ͩɺ࣮ࡍ͸ਖ਼൓ରͩͬͨɻࢲ͕ձͬͨதͰ࠷଎ͷϓϩάϥ Ϛʔ͸ɺίʔυΛѻ͍΍͍͢Α͏ʹอͭ͜ͱʹಛʹ஫ҙΛ෷ͬ ͍ͯͨɻ ʰϨΨγʔίʔυ͔Βͷ୤٫ʱQ

ίʔυΛॻ͘଎͞ͱίʔυͷ͖Ε͍͞ʹؔ࿈͕͋Δͱೝࣝͨ͠ ͋ͱͰ΋ɺࢲ͸ͦͷͭͷ͍͋ͩͷҼՌؔ܎Λݟ͚ͭΔͷʹ࣌ ؒΛཁͨ͠ɻ ίʔυͷ඼࣭Λߴ͘อ͍ͬͯͨʮʹ΋ؔΘΒͣʯ଎͍ͷͰ͸ͳ ͍ɻίʔυͷ඼࣭Λߴ͘อ͍ͬͯͨʮ͔Βͦ͜ʯ଎͍ͷͩɻ ͜ͷ͜ͱΛཧղͨ͠Βɺιϑτ΢ΣΞ։ൃʹର͢Δ ݟํ͕มΘͬͨɻ ʰϨΨγʔίʔυ͔Βͷ୤٫ʱQQ

ίʔυͷ඼࣭Λߴ͘อ͍ͬͯͨ ʮʹ΋ؔΘΒͣʯ଎͍ͷͰ͸ͳ ͍ɻίʔυͷ඼࣭Λߴ͘อͬͯ ͍ͨʮ͔Βͦ͜ʯ଎͍ͷͩɻ %BWJE4DPUU#FSOTUFJO ʰϨΨγʔίʔυ͔Βͷ୤٫ʱ QQ

࣭ อकੑ εϐʔυ ίʔυͷ඼࣭Λ٘ਜ਼ʹ͔ͨ͠Β଎͍ͷͰ͸ͳ͘ നؙ෇͖໼ҹෛͷ઀ଓࠜݩ͕૿͑Ε͹ઌ͸ݮΔɻࠜݩ͕ݮΕ͹ઌ͸૿͑Δ

࣭ อकੑ εϐʔυ ίʔυͷ඼࣭Λߴ͘อ͍ͬͯͨʮ͔Βͦ͜ʯ଎͍ ໼ҹਖ਼ͷ઀ଓࠜݩ͕૿͑Ε͹ઌ΋૿͑Δɻࠜݩ͕ݮΕ͹ઌ΋ݮΔ

Ͱ͸ εϐʔυ͔Β࣭΁ͷ Өڹ͸Ͳ͏͔

࣭ อकੑ εϐʔυ Ͱ͸εϐʔυ͔Β࣭ อकੑ ΁ͷӨڹ͸Ͳ͏͔

඼࣭͸ѱ͍ͱجຊతʹख໭ΓΛੜΉͷͰ଎౓ʹ௓ͶฦΔɻख໭ͬͯ Δ࣌ؒ͸ֶͼΛ͏·ͳ͍࣌ؒɻ඼࣭ΛԼ͛Δͱ͍͏൑அ͸ֶͼͷ଎ ౓௿ԼΛڐ༰͢Δͱ͜ͱɻ ैདྷͷమ൘ ͩͱޡղ͞Ε͍ͯͨ ͩͬͨ඼࣭ͯͯ͢଎౓͋͛Α͏͸ ඼࣭͸ྼԽ͢Ε͹ख໭Γ͕ൃੜ͢Δ͚ͩͰɺ݁ہ͸ϦʔυλΠϜͷ ૿Ճʹ௓ͶฦΔͷͰ΍Ί·͠ΐ͏ɻ ඼࣭͸ྼԽ͢Ε͹ϦʔυλΠϜͷ૿Ճʹ௓ͶฦΔ IUUQJLFZIBUFCMPKQFOUSZ

ϦʔυλΠϜ͕૿Ճ͢ΔͱԾઆݕূϓϩηε͕ճΒͳ͍ IUUQJLFZIBUFCMPKQFOUSZ

ຊ౰ͷؔ܎

ຊ౰ͷؔ܎ɹ w಺෦඼࣭͕εϐʔυΛੜΈ wεϐʔυֶ͕ͼͷϧʔϓΛੜΈ wֶͼͷϧʔϓ͕֎෦඼࣭ΛੜΈ w֎෦඼࣭͕ڝ૪ྗΛੜΈ wڝ૪ྗ͕ച্ΛੜΈ wച্͕಺෦඼࣭ΛҭΉ ˞ྑ͍΋ͷΛ࡞Ε͹ചΕΔͱ ͍͏Θ͚Ͱ͸ͳ͍ͷͰɺ͜͜ ͸ͦ͏؆୯Ͱ΋୯७Ͱ΋ͳ͍

࣭ εϐʔυ ຊ౰ͷؔ܎ɹ ໼ҹਖ਼ͷ઀ଓࠜݩ͕૿͑Ε͹ઌ΋૿͑Δɻࠜݩ͕ݮΕ͹ઌ΋ݮΔ

ʮ࣭WTεϐʔυʯͱ͍͏֓೦͸ࠜຊతʹؒҧ͍ͬͯΔͱࢥ͏ɻ ͩͬͯૉૣ͘։ൃΛ͠ͳͯ͘͸؀ڥɺ͋Δ͍͸ࣗ෼ͷ؀ڥͷཧղͷม Խʹιϑτ΢ΣΞ͕͍ͭͯ͜Εͣɺιϑτ΢ΣΞ͕ղܾ͢΂͖໰୊͕ ղܾͰ͖ͳ͘ͳΓɺඞવతʹ࣭͕མͪͯ͠·͏ɻ ٯʹɺ࣭ͷߴ͍ιϑτ΢ΣΞΛॻ͔ͳͯ͘͸ɺͳʹ͔͋Δ౓ʹΠϯϑ ϥ่͕յ͠ɺૉૣ͘։ൃΛ͢Δ͜ͱ͕Ͱ͖ͳ͘ͳͬͯ͠·͏ɻΠϯϑ ϥͷ่յ͸ɺ΍ΔؾΛ࡟͙ͷͰಛʹ͕ͨͪѱ͍ɻ IUUQTLOPIKQBOTXFSTEDB Evan Priestley

࣭WTεϐʔυͱ͍͏ೋ཯എ൓ͷؔ܎͸ɺ ہॴతͳ΋ͷͰ͔͠ͳ͍ɻ େҬతʹ͸ɺยํΛ٘ਜ਼ʹͨ͠৔߹ɺ஌ Β͵͏ͪʹ΋͏Ұͭ΋٘ਜ਼ʹ͍ͯ͠Δͱ ͍͏͜ͱΛ͓๨Εͳ͘ɻ IUUQTLOPIKQBOTXFSTEDB Evan Priestley

ݱ୅ʹ͓͚Δ࣭ͱεϐʔυͭͷΩʔϝτϦΫε wϦʔυλΠϜ wσϓϩΠස౓ w.553 ฏۉम෮࣌ؒ wมߋࣦഊ཰ IUUQTXXXBNB[PODPKQEQ

ϦʔυλΠϜͱσϓϩΠස౓ԾઆݕূϓϩηεΛਝ଎ʹճ͢ IUUQJLFZIBUFCMPKQFOUSZ

IUUQJLFZIBUFCMPKQFOUSZ ϦʔυλΠϜͱσϓϩΠස౓ϑϩʔޮ཰ͱϦιʔεޮ཰ Ϧιʔεޮ཰ ϑϩʔޮ཰

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IUUQTDMPVEHPPHMFDPNEFWPQTTUBUFPGEFWPQT

ΤϦʔτ ϋΠύϑΥʔϚʔ ϛσΟΞϜ ύϑΥʔϚʔ ϩʔύϑΥʔϚʔ ϦʔυλΠϜ ೔ະຬ ೔͔Βिؒ ि͔ؒΒϱ݄ ϱ݄͔Βϱ݄
σϓϩΠස౓ ΦϯσϚϯυ ೔ෳ਺ճ ೔ճ͔Βिճ िճ͔Β݄ճ ϱ݄͔Βϱ݄ .553 ࣌ؒະຬ ೔ະຬ ೔ະຬ ि͔ؒΒϱ݄ มߋࣦഊ཰ ͭͷΩʔϝτϦΫε೥ͷௐࠪʢສ݅Ҏ্ͷճ౴ΛΫϥελʔ෼ੳʣ w։ൃ଎౓ͱ඼࣭͸τϨʔυΦϑͷؔ܎Ͱ͸ͳ͍ w૊৫ؒͷࠩ͸͔ͳΓେ͖͘ɺ͞Βʹ։͍͍ͯΔʢʣ wѹ౗తͳࠩ͸ܧଓతσϦόϦ΍%FW0QT΁ͷ૊৫తͳ౤ࢿͷࠩ IUUQTXXXTMJEFTIBSFOFU%FW0QT8FCJOBSTBDDFMFSBUFTUBUFPGEFWPQTTVSWFZSFTVMUTBSFJO

ΤϦʔτ ΤϦʔτͱϩʔύϑΥʔϚʔͷࠩ ϩʔύϑΥʔϚʔ ϦʔυλΠϜ ೔ະຬ ഒ ϱ݄͔Βϱ݄ σϓϩΠස౓ ΦϯσϚϯυ ೔ෳ਺ճ
ഒ ϱ݄͔Βϱ݄ .553 ࣌ؒະຬ ि͔ؒΒϱ݄ มߋࣦഊ཰ ͭͷΩʔϝτϦΫεΤϦʔτΫϥελͱϩʔύϑΥʔϚʔΫϥελͷࠩ w։ൃ଎౓ͱ඼࣭͸τϨʔυΦϑͷؔ܎Ͱ͸ͳ͍ w૊৫ؒͷࠩ͸͔ͳΓେ͖͘ɺ͞Βʹ։͍͍ͯΔʢʣ wѹ౗తͳࠩ͸ܧଓతσϦόϦ΍%FW0QT΁ͷ૊৫తͳ౤ࢿͷࠩ IUUQTXXXTMJEFTIBSFOFU%FW0QT8FCJOBSTBDDFMFSBUFTUBUFPGEFWPQTTVSWFZSFTVMUTBSFJO

อकੑΛ٘ਜ਼ʹ͢Ε͹εϐʔυ͸ಘΒΕΔʁ w୹ظతʹ͸ಘΒΕΔ wதظతʹ͸ٯޮՌʹͳΔ w௕ظతʹ͸க໋ইʹͳΔ

ʮ୹ظతதظతʯͷڥ໨͸ʁ ͜͜Ͱ͍͏ʮ඼࣭ʯͱ͸ʁ

ςετࣗಈԽͷଛӹ෼ذ఺͸ʮճʯ IUUQTXXXBNB[PODPKQEQ ͓ΑͦճͰ खಈςετͱࣗಈԽ͞Εͨςετͷ ίετ͕ٯస͢Δ

IUUQTXXXBNB[PODPKQEQ "1IJMPTPQIZPG4PGUXBSF%FTJHO good design eventually pays for itself, and sooner
than you might think.

໦͜ΓͷδϨϯϚ illustrated by @mty_mno IUUQUFTUFSDIBOIBUFOBEJBSZDPNFOUSZ

಺෦඼࣭΁ͷ౤ࢿͷଛӹ෼ذ఺͸ ೥ޙͱ͔Ͱ͸ͳ͘ ϲ݄Ҏ಺ʹݱΕΔ IUUQTNBSUJOGPXMFSDPNBSUJDMFTJTRVBMJUZXPSUIDPTUIUNM ಺෦඼࣭΁ͷ౤ࢿͷଛӹ෼ذ఺͸ϲ݄Ҏ಺ʹݱΕΔ

w୹ظతʹ͸ಘΒΕΔ wϲ݄ޙʹ͸ٯޮՌʹͳΔ w௕ظతʹ͸க໋ইʹͳΔ อकੑΛ٘ਜ਼ʹ͢Ε͹εϐʔυ͸ಘΒΕΔʁ ϲ݄Ҏ಺Ͱ͋Ε͹ɺ಺෦඼࣭΁ͷ౤ࢿͷडӹऀ͸ࣗ෼ͨͪࣗ਎ Ͱ͋Γɺͭ·Γಓಙ΍ᛗዟͷ࿩Ͱ͸ͳ͘ଛಘͷ࿩Ͱ͋Δ

ϦϑΝΫλϦϯά༻ͷϦιʔεΛ७૿ͨ͠༁Ͱ͸ͳ͍ɻTQSJOU಺ ͷΛ౤ࢿ͢ΔͱܾΊͨɻ࠷ॳ͸ϕϩγςΟ͕མ͕ͪͨɺ ϲ݄ܦͬͨޙ͸໌֬ʹσϦόϦʔ଎౓͕ߴ·ͬͨɻʢྫΛڍ ͛Δͱɺϲ݄͔͔ΔͱݴΘΕ͍ͯͨن໛ͷ։ൃ͕೔ͰऴΘΔΑ ͏ʹͳͬͨʣ ͨ·ͨ·ࢀՃͨ͠ΠϕϯτͰU@XBEB͞Μͷ ʮ࣭ͱεϐʔυʯʹؔ͢ΔߨԋΛฉ͖ɺ ΋ͱ΋ͱ೰ΜͰ͍ͨϙΠϯτͩͬͨͷͰ ਧͬ੾Δ͜ͱ͕Ͱ͖ͨɻ ΩϟσΟגࣜձ༷ࣾͷࣄྫ
IUUQTDBEEJUFDIBSDIJWFT

ߥͿΔ࢛ఱԦ͸είʔϓΛ࡟Ε ༩͑ΒΕͨ࣌ؒʹରͯ͠΍Δ΂͖͜ͱ͕ଟ͗͢Δ৔߹ɺͲ͏͢΂͖͔ B είʔϓΛ࡟Δ C ΋ͬͱਓΛ૿΍͢ D ϦϦʔε೔ΛԆظ͢Δ E
඼࣭Λ٘ਜ਼ʹ͢Δ ʰΞδϟΠϧαϜϥΠʱQ

͔͜͜ΒԆ௕ઓ

Ͱ͸εϐʔυ͓Αͼ࣭͸ ԿͱτϨʔυΦϑͳͷ͔

IUUQTCIBUFOBOFKQFOUSZTTQFBLFSEFDLDPNUXBEBRVBMJUZBOETQFFE Ͱ͸εϐʔυͱ࣭͸ԿͱτϨʔυΦϑͳͷ͔࣍ੈ୅΁ͷڭҭɺ৽ٕज़ͷௐࠪɺଟ༷ੑͷ֬อ

IUUQTPTBIBUFOBCMPHDPNFOUSZ Ͱ͸ɺ඼࣭ͱ଎౓ʹ͍ͭͯͷτϨʔυΦϑ͕ҙࣝ͞ΕΔ ͱ͖ɺ࣮ࡍʹ͸ԿͱԿ͕ṝʹ͔͚ΒΕ͍ͯΔͷ͔ɻ ͦΕ͸֤ݸਓͰ͸ͳ͘ϓϩμΫτશମͷ඼࣭ͱ଎౓͕ṝ ʹ͔͚ΒΕ͍ͯΔͷͰ͸ͳ͍͔ɻݴ͍׵͑Ε͹ɺϓϩμ Ϋτͷ඼࣭Λࢧ͑ΔͨΊʹඞཁͳϝϯόʔͷ੒௕ͱͦͷ ੒௕ͷͨΊʹඞཁͳϑΟʔυόοΫ΍ֶशͷ͕࣌ؒṝʹ ͔͚ΒΕ͍ͯΔͷͰ͸ͳ͍͔ͱࢥ͏ɻ

ຊ෺ͷྗΛ͚ͭΔʹ͸ ͕͔͔࣌ؒΔ

ιϑτ΢ΣΞͷ։ൃʹ࠷ॳ͔Β࠷ޙ·ͰؔΘΔͱ͍͏ܦݧ͸ͱͯ΋وॏ ͩͬͨΜ͡Όͳ͍ͩΖ͏͔ɻͳͥͳΒɺϓϩδΣΫτ։࢝࣌ͷμϝͳσβ Πϯͷͬ͠΃ฦ͠ΛɺޙͰࣗ෼ͰϞϩʹड͚Δ͔Βͩɻ ౰ॳ΅͘͸ɺ΄ͱΜͲߟ͑ͣίʔυΛʮΞϯμʔΤϯδχΞϦϯάʯ͍ͯ͠ ͨɻޙʑ͜ΕΛա౓ʹमਖ਼ͯ͠͠·͍ɺશͯΛʮΦʔόʔΤϯδχΞϦϯ άʯ͠࡞ΓࠐΈ͗ͯ͢͠·ͬͨɻ̎೥൒ͱ͍͏࣌ؒ͸͜͏͍ࣦͬͨഊΛܦ ݧ͢Δʹ͸े෼ͳ࣌ؒͰɺࣙΊΔ͜Ζʹ͸γεςϜͷσβΠϯͷԘക͕ɺ ͔ͳΓΘ͔ΔΑ͏ʹͳ͍ͬͯͨͱࢥ͏ɻ IUUQTLOPIKQBOTXFSTEDB Evan
Priestley

Ұ൪ॏཁͰҰ൪΍͔͍ͬͳεΩϧ͸γεςϜΛઃܭ͢ΔͨΊͷ൑அྗͩɻ ݶΓͳ͘γϯϓϧͳσβΠϯͱ͍͏ͷ͸ͳ͔ͳ͔ڭ͑ΒΕΔ΋ͷͰ͸ͳ ͘ɺେํܦݧΛॏͶ֮ͯ͑Δ΋ͷͩɻ ͜ͷʮ൑அྗʯ͸ɺϓϩάϥϚʔʹͱͬͯඇৗʹॏཁͳͷ͕ͩɺͦ͏؆୯ ʹڭ͑ΒΕΔ΋ͷͰ΋ͳ͍ɻ΅͕͘஌ΔݶΓɺ൑அྗΛ͚ͭΔ Ұ൪ͷํ๏͸ɺࣗ෼Ͱઃܭͨ͠γεςϜΛ௕͍ؒϝϯς͢Δ ͜ͱͩͱࢥ͏ IUUQTLOPIKQBOTXFSTEDB Evan Priestley

඼࣭ͱίετ͸ τϨʔυΦϑ͔

1IJMJQ$SPTCZ2VBMJUZJT'SFF඼࣭Ξοϓ͸ίετΞοϓ͔μ΢ϯ͔ ίετΞοϓઆ ίετμ΢ϯઆ

IUUQTTQFBLFSEFDLDPNTIJNBTIJNBTUBSURVBMJUZSFBMGSFFDBNQBJHO 2VBMJUZJT'SFF㲈඼࣭࣮࣭ແྉ

Ͳͷ͘Β͍ ઃܭʹ౤ࢿ͢Δ͔

ΞʔΩςΫςΟϯά͍ͭɺͲΕ͚ͩʁ ,4-0$ສߦͷϓϩδΣΫτͷ ઌߦઃܭͷεΠʔτεϙοτ IUUQTXXXPSFJMMZDPKQCPPLT

ιϑτ΢ΣΞͷن໛͕εΠʔτεϙοτʹ༩͑ΔӨڹ IUUQTXXXPSFJMMZDPKQCPPLT

ιϑτ΢ΣΞͷن໛͕εΠʔτεϙοτʹ༩͑ΔӨڹ w ιϑτ΢ΣΞγεςϜ͕େ͖͘ͳΕ͹ͳΔ΄Ͳɺલ෷͍ͷΞʔΩς Ϋνϟઃܭ͔Βड͚ΔԸܙ͸େ͖͘ͳΔ w খن໛ʢສߦʣͷιϑτ΢ΣΞγεςϜͰ͸ɺલ෷͍ͷΞʔΩς Ϋνϟࡦఆ͔Β͸΄ͱΜͲԸܙΛड͚ΒΕͳ͍ w ΞʔΩςΫνϟઃܭʹগ͔͠͠౤ࢿ͠ͳ͍ͱɺڧ྽ͳͬ͠΃ฦ͕͠ དྷΔ͜ͱ͕༧૝͞ΕΔ
w ΞʔΩςΫνϟʹ౤ࢿ͢Ε͹͢Δ΄Ͳɺඞཁͳख௚͠͸গͳ͘ͳΔ IUUQTXXXPSFJMMZDPKQCPPLT

ཁٻͷมಈ΍ܽؕίετ͕εΠʔτεϙοτʹ༩͑ΔӨڹ ཁٻͷมಈ͕େ͖͍৔߹ ͸ɺٸ଎ͳมԽʹରԠ͢Δ ͨΊͷ෼ੳ΍จॻԽͷख໭ ΓͷͨΊɺઌߦઃܭͷޮՌ ͸Լ͕Δ ߴ͍৴པੑΛٻΊΒΕܽؕ ίετ͕ߴ͍৔߹͸ɺΞʔ ΩςΫςΟϯάͷඞཁੑ͕ ߴ·Δ
IUUQTXXXPSFJMMZDPKQCPPLT

͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ w ʮ඼࣭ͱεϐʔυ͸τϨʔυΦϑͷؔ܎ʹ͋Δʯ͸େ͖ͳޡղ w ʮ඼࣭ʯͷ໊ͷ΋ͱʹ٘ਜ਼ʹ͞ΕΔͷ͸಺෦඼࣭ͷಛʹอकੑ ʢςετ༰қੑɺཧղ༰қੑɺมߋ༰қੑʣ w ࣮ࡍʹ͸อकੑΛߴΊΕ͹εϐʔυ͸্͕Δ͠ɺอकੑΛམͱͤ͹ εϐʔυ͸Լ͕Δ w
εϐʔυΛམͱͯ͠΋อकੑ͸্͕Βͳ͍͠ɺεϐʔυΛམͱ͢ͱԾઆݕ ূϓϩηε͕ճΒͳ͍ w ಺෦඼࣭΁ͷ౤ࢿͷଛӹ෼ذ఺͸ҙ֎ͱૣ͘ ϲ݄Ҏ಺ ΍ͬͯ͘Δ w ϲ݄Ҏ಺ͱ͍͏͜ͱ͸डӹऀ͸ࣗ෼ͨͪࣗ਎Ͱ͋Γɺͭ·Γಓಙ΍ᛗዟ ͷ࿩Ͱ͸ͳ͘ଛಘͷ࿩Ͱ͋Δ w εϐʔυ͓Αͼ࣭ͱτϨʔυΦϑͳͷ͸ڭҭɺ੒௕ɺଟ༷ੑ΁ͷ౤ࢿ

質とスピード（2020秋100分拡大版） / Quality and Speed 2020 A...

質とスピード（2020秋100分拡大版） / Quality and Speed 2020 Autumn Edition

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