ソフトウェアアーキテクトのための意思決定術: Software Architecture and Decision-Making

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ 4PGUXBSF"SDIJUFDUVSFBOE%FDJTJPO.BLJOH ౡాߒೋ !TOPP[FS 'PSLXFMM-JCSBSZ ENISHI TECH INC.

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ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ Ϧʔμʔγοϓٕज़ϓϩμΫτϚωδϝϯτͷ׆༻ 4SJOBUI1FSFSBஶɺౡాߒೋ༁ ೥݄ʹ"EEJTPO8FTMFZ1SPGFTTJPOBMΑΓग़൛͞Εͨʰ4PGUXBSF "SDIJUFDUVSFBOE%FDJTJPO.BLJOHʱʢ*4#/ʣͷશ༁ ஶऀʹ͍ͭͯ "QBDIFͷΦʔϓϯιʔε։ൃऀͱͯ͠೥Ҏ্ͷΩϟϦΞΛ࣋ͪɺ͍ͭ͘ ͔ͷ"QBDIFϓϩδΣΫτϓϩμΫτͷΞʔΩςΫνϟࡦఆʹ΋ܞΘͬͯ ͖͍ͯΔݱ໾ɾϕςϥϯͷιϑτ΢ΣΞΞʔΩςΫτ ༁ॻ͸೥݄ʹΠϯϓϨε͔Βץߦ

൑அྗͷෆ଍ͱ͸ɿ w ൑அͷࡐྉͱͳΔલఏ΍੍໿Λे෼ʹͱΒ͖͑Ε͍ͯͳ͍ w ൑அͷࡍʹߟྀ͢΂͖؍఺Λे෼ʹ໢ཏͰ͖͍ͯͳ͍ w ͦ΋ͦ΋ʮ൑அʯΛ͍ͯ͠ͳ͍ w ྲྀߦʹྲྀ͞Ε͍ͯΔʗݱ࣮Λݟͣʹ஌͚ࣝͩͷ൑அʹͳ͍ͬͯΔʗ૊৫ͷཁ੥ʹߟ͑ͳ͠ʹै͍ͬͯΔ ຊॻͷϞνϕʔγϣϯ
ιϑτ΢ΣΞΞʔΩςΫνϟͷࣦഊͷଟ͘͸ɺ஌ࣝෆ଍Ͱ͸ͳ͘൑அྗෆ଍ʹى͖͍ͯΔ ιϑτ΢ΣΞΞʔΩςΫνϟʹ͍ͭͯॻ͔Εͨॻ੶ɺҙࢥܾఆ΍Ϧʔμʔγοϓʹ͍ͭͯͷॻ੶͸ͦΕͧΕ ଟ͋͘Δ͕ͦΕΒ͕ॏͳΔॻ੶͕ඞཁͩͱߟ͑ͨ

ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠

ᶃιϑτ΢ΣΞΞʔΩςΫνϟ͸͞·͟·ͳ΋ͷʹӨڹΛड͚Δɾ༩͑Δ ਤԿ͕ΞʔΩςΫνϟʹӨڹΛ༩͑Δʁ ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠

ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠ ͦͷͨΊɺ͢΂ͯͷܾఆ͸ɺଟ͘ͷ૬൓͢ΔཁૉΛߟྀ͠ͳ͚Ε͹ͳΒͳ͍ ᶃιϑτ΢ΣΞΞʔΩςΫνϟ͸͞·͟·ͳ΋ͷʹӨڹΛड͚Δɾ༩͑Δ

ᶄιϑτ΢ΣΞγεςϜͷ։ൃʹ͸ෆ࣮֬ੑ͕ଘࡏ͢Δ ஌ͬͯͷ௨Γɺط஌ͷ஌ͱ͍͏΋ͷ͕͋Δɻ͜Ε͸զʑ͕஌͍ͬͯΔͱ஌͍ͬͯΔ͜ͱͩɻ ·ͨɺط஌ͷະ஌΋͋Δɻ͢ͳΘͪɺݱ࣌఺Ͱط஌Ͱͳ͍ͱΘ͔͍ͬͯΔࣄฑͩɻ ͔͠͠ɺະ஌ͷະ஌΋͋Δɻ͜Ε͸զʑ͕஌Βͳ͍ͱ͍͏͜ͱ͑͞஌Βͳ͍͜ͱͩɻ υφϧυɾϥϜζϑΣϧυ ໨ඪͷෆ࣮֬ੑʢຊ౰ʹ࡞Γ͍ͨ΋ͷ͸Կ͔ʣ ํ๏ͷෆ࣮֬ੑʢͲ͏΍ͬͯ࡞Ε͹͍͍ͷ͔ʣ l ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠

ᶃιϑτ΢ΣΞΞʔΩςΫνϟ͸͞·͟·ͳ΋ͷʹӨڹΛड͚Δɾ༩͑Δ ᶄιϑτ΢ΣΞγεςϜͷ։ൃʹ͸ෆ࣮֬ੑ͕ଘࡏ͢Δ ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠

ෆ࣮֬ੑΛ؅ཧ͠ͳ͕Βɺ૬൓͢Δ͞·͟·ͳཁૉΛߟྀ͠ͳ͕Βɺ ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆΛଓ͚͍ͯͨ͘ΊͷώϯτͱͳΔҰ࡭

ຊॻͷՁ஋ w ͦͷ࣌఺ʹ͓͚Δ੍໿ɾલఏΛཧղ͢ΔͨΊͷͭͷ໰͍ w ద੾ͳ൑அͷ࣠ͱͳΔͭͷݪଇ w े෼ͳߟྀͷͨΊͷͭͷ؍఺ ιϑτ΢ΣΞΞʔΩςΫνϟͰݕ౼ͨ͠ํ͕ྑ͍τϐοΫʢͭͷ؍఺ʣ͝ͱʹɺͲͷΑ͏ͳ લఏɾ੍໿Λߟྀͨ͠ํ͕Α͍͔ʢͭͷ໰͍ʣɺͲͷΑ͏ʹਐΊ͍ͯ͘ͱΑ͍͔ʢͭͷݪ ଇʣͱ͍ͬͨҙࢥܾఆͷΞυόΠε͕ॻ͔Ε͍ͯΔ
ෆ࣮֬ੑΛ؅ཧ͠ͳ͕Βɺ૬൓͢Δ͞·͟·ͳཁૉΛߟྀ͠ͳ͕Βɺ ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆΛଓ͚͍ͯ͘ͷʹ໾ཱͭಓ۩Λఏڙ

ʰιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ʱͷ஍ਤ ষίʔσΟωʔγϣϯ ষηΩϡϦςΟ΁ͷରԠ ষঢ়ଶͷҰ؏ੑͷอ࣋ γεςϜϨϕϧͰͷ؍఺ ষߴՄ༻ੑͱεέʔϥϏϦςΟ΁ͷରԠ ষαʔόΞʔΩςΫνϟ ষϚΫϩΞʔΩςΫνϟ ষϚΠΫϩαʔϏεͰͷߟྀࣄ߲ αʔϏεϨϕϧͰͷ؍఺
ӡ༻ϨϕϧͰͷ؍఺ ষ҆ఆͨ͠γεςϜߏங ΞʔΩςΫτ͕ԡ͓͑ͯ͘͞΂͖஌ࣝʢݟམͱ͕ͪ͠ͳ؍఺ʣ ষγεςϜύϑΥʔϚϯε ̐ষ69 ͭͷ໰͍ ͭͷ؍఺ ষγεςϜɾઃܭɾΞʔΩςΫνϟ ͭͷݪଇ ద੾ͳ൑அͷ࣠ ੍໿ɾલఏΛཧղ͢Δ े෼ͳߟྀͷͨΊͷ ҙࢥܾఆΛࢧԉ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ ষγεςϜύϑΥʔϚϯε w ܭࢉػͷύϑΥʔϚϯεʹ͍ͭͯͷϞσϧ΍ύϑΥʔϚϯεͷ࠷దԽςΫ χοΫʹ͍ͭͯղઆ͞ΕΔষ w ஌͓ͬͯ͘ͱ͔֬ʹྑ͍಺༰Ͱ͕͢ɺಡऀ૚Λߟ͑ΔͱҰ൪ϋʔυϧ͕ߴ͍ষͱࢥ ΘΕΔͷͰɺ೉͘͠ײͨ͡ΒҰ୴αϥοͱಡΜͰઌʹਐΜͰ΋େৎ෉Ͱ͢ʣ w ͜ͷลΓʹ͍͔ͭͯͬ͠Γֶͼ͍ͨ৔߹ʹ͸ʰৄղγεςϜɾύϑΥʔϚϯεʱ
ʢΦϥΠϦʔδϟύϯʣΛ͓קΊ͠·͢

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ ষϢʔβʔΤΫεϖϦΤϯεʢ69ʣ w ΞʔΩςΫνϟͷॻ੶Ͱ͋·ΓޠΒΕͳ͍69ͷߟ͑ํ͕ղઆ͞Εͨষ w ઃఆɺ"1*ɺ֦ுػೳͱ͍ͬͨɺ69Ͱݟམ͞Ε͕ͪͳϢʔβʔ઀఺ʹ͍ͭ ͯɺઃܭͷࡍʹ69؍఺ͰͲͷΑ͏ͳ఺ʹߟྀ͢Δඞཁ͕͋Δ͔Λղઆ w ΞʔΩςΫτͰͳͯ͘΋஌͓ͬͯ͘ͱՁ஋͕͋Δ಺༰

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ w γεςϜશମͷߏ੒Λߟ͑Δʹ͋ͨͬͯͷେ͖ͳߟ͑ํΛղઆ w جຊతͳํ਑ w ϏϧσΟϯάϒϩοΫͱͦͷ࣮૷ΛՄೳͳݶΓ࠶ར༻্ͨ͠Ͱɺ͚ܽͯ ͍Δ෦෼ΛαʔϏεΛ࢖࣮ͬͯ૷͢Δ ̑ষϚΫϩΞʔΩςΫνϟ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ w ϫʔΫϑϩʔʢαʔϏεؒͷ࿈ܞʣΛͲ͏؅ཧ͢Δ͔Λܾఆ͢Δ w ΦʔέετϨʔγϣϯPSίϨΦάϥϑΟ w ͦͷͨΊʹͲΜͳϏϧσΟϯάϒϩοΫΛ࢖༻͢Δ͔ ̒ষίʔσΟωʔγϣϯ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ w σʔλ੔߹ੑΛอূ͢ΔൣғͱΞϓϩʔνΛܾఆ͢Δ w τϥϯβΫγϣϯPSิঈʢ݁Ռ੔߹ੑʣ w ͦͷͨΊʹͲΜͳϏϧσΟϯάϒϩοΫΛ࢖༻͢Δ͔ ̓ষঢ়ଶͷҰ؏ੑͷอ࣋

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ w ΞΠσϯςΟςΟ؅ཧɺೝূΞϓϩʔνɺೝՄϞσϧɺ๏ͷ९कɺηΩϡ ϦςΟઓུͳͲʹ͍ͭͯ w ͔ͬ͠Γֶͼ͍ͨ৔߹ʹ͸ҎԼͷΑ͏ͳॻ੶ɾαΠτΛ͓קΊ͠·͢ IUUQTXXXPTPIRDPNBDBEFNZ ̔ষηΩϡϦςΟ 0TP"VUIPSJ[BUJPO"DBEFNZ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ w Մ༻ੑΛͲ͏୲อ͢Δ͔ w ϨϓϦέʔγϣϯPSߴ଎ϦΧόϦʔ w ඞཁʹԠͯ͡γεςϜΛͲ͏εέʔϦϯά͢Δ͔Λܾఆ͢Δ w ϘτϧωοΫΛஞ࣍ղফ͍͔ͯ͘͠PSεέʔϦϯάՄೳͳࣗݾ׬݁ܕ ͷϢχοτΛߏங͍ͯ͘͠
̕ষߴՄ༻ੑͱεέʔϥϏϦςΟ΁ͷରԠ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ w ϚΠΫϩαʔϏεΞʔΩςΫνϟʢ.4"ʣ͔ʹ͢Δ͔Ͳ͏͔ w .4"Λ࠾༻͢Δ৔߹ɺ͜Ε·Ͱͷ؍఺ʹ͍ͭͯԿΛߟ͑Δඞཁ͕͋Δ͔ w .4"෼ࢄΞʔΩςΫνϟͷߟྀࣄ߲΍τϨʔυΦϑΛ΋ͬͱษڧ͍ͨ͠৔߹ʹ͸ ʰϞϊϦε͔ΒϚΠΫϩαʔϏε΁ʱʰιϑτ΢ΣΞΞʔΩςΫνϟɾϋʔυύʔ πʱΛ͓קΊ͠·͢ ̍̌ষϚΠΫϩαʔϏεΞʔΩςΫνϟͰͷߟྀࣄ߲

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ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ w αʔϏεϨϕϧͷߏ੒Λܾఆ͢Δ w ϦΫΤετΛͲͷΑ͏ʹࡹ͔͘ɺͲͷΑ͏ʹ࠷దԽ͢Δ͔ w جຊతͳํ਑ w ඪ४తͳαʔόΞʔΩςΫνϟ͔Β࢝ΊͯɺඞཁʹԠͯ͡ߴ౓ͳςΫχ οΫΛݕ౼͢Δ
̍̍ষαʔόʔΞʔΩςΫνϟ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷ؍఺ w ҆ఆੑΛͲͷΑ͏ʹ࣮ݱ͢Δ͔Λܾఆ͢Δ w ো֐ΛͲͷΑ͏ʹ༧஌ɾݕ஌͢Δ͔ʢՄ؍ଌੑΛͲͷΑ͏ʹ࣮ݱ͢Δ͔ʣ w ো֐ʹͲͷΑ͏ʹରॲͰ͖Δ͔ w ΑΓৄֶ͘͠ͼ͍ͨ৔߹͸ɺ43&΍ΦϒβʔόϏϦςΟؔ࿈ͷॻ੶Λ͓קΊ͠·͢ ̍ষ҆ఆͨ͠γεςϜͷߏங

ᶃιϑτ΢ΣΞΞʔΩςΫνϟ͸͞·͟·ͳ΋ͷʹӨڹΛड͚Δɾ༩͑Δ ᶄιϑτ΢ΣΞγεςϜͷ։ൃʹ͸ෆ࣮֬ੑ͕ଘࡏ͢Δ ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠ ˠͭͷ໰͍Ͱߟྀ͢΂͖લఏ΍੍໿Λ໌Β͔ʹ͢Δ ˠͭͷݪଇʹԊͬͨΞϓϩʔνΛऔΔ͜ͱͰෆ࣮֬ੑΛ؅ཧ͢Δ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़̑ͭͷ໰͍ ⁞ ࢢ৔౤ೖʹద੾ͳλΠϛϯά͸͍͔ͭʁ   νʔϜͷεΩϧϨϕϧ͸Ͳͷఔ౓͔ʁ ⁠ γεςϜύϑΥʔϚϯεͷײ౓͸Ͳͷ͘Β͍͔ʁ ⁡ γεςϜΛॻ͖௚ͤΔͷ͸͍͔ͭʁ ⁢
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೉͍͠໰୊͸Ͳ͜ʹ͋Δ͔ʁ Ϗδωε্ͷ੍໿ ૊৫తͳ੍໿ ΞʔΩςΫνϟཁ݅ʢ඼࣭ಛੑɾඇػೳཁ݅ʣ ΞʔΩςΫνϟཁ݅ʢ඼࣭ಛੑɾඇػೳཁ݅ʣ औΓ૊Ή΂͖໰୊΍༏ઌॱҐ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़̑ͭͷ໰͍ ⁡ γεςϜΛॻ͖௚ͤΔͷ͸͍͔ͭʁ w ΞʔΩςΫνϟཁ݅ʢ඼࣭ಛੑɺඇػೳཁ݅ʣΛཧղ͢ΔͨΊͷ໰͍͔͚ w ελʔτΞοϓͷஈ֊ͰඞཁͳΞʔΩςΫνϟͱɺεέʔϧͨ͠ஈ֊ͰඞཁͳΞ ʔΩςΫνϟ͸ҟͳΔ w ஈ֊͕มΘͬͨΒࣺͯΔͱ͍͏લఏͰཁ݅ΛఆΊΔ͜ͱͰɺγϯϓϧͳΞʔΩ
ςΫνϟΛૂ͑Δ w ٘ਜ਼తΞʔΩςΫνϟ

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ΞʔΩςΫνϟ͕٘ਜ਼త͔ͩΒͱ͍ͬͯɺͦͷιϑτ΢ΣΞͷ಺త඼࣭͕Ͳ ͏Ͱ΋Α͘ͳΔΘ͚Ͱ͸ͳ͍ɻ;ͭ͏಺త඼࣭Λ٘ਜ਼ʹ͢Δͱɺަ׵ͷ࣌ظ ͕དྷΔΑΓૣ͘ࠅ͍໨ʹ͋͏ɻͦͷίʔυϕʔεͷҾୀʹ޲͚طʹ࡞ۀͯ͠ ͍ΔͳΒผ͕ͩɻ༏ΕͨϞδϡʔϧੑ͸݈΍͔ͳίʔυͷෆՄܽͳཁૉͩɻ ͦͯ͠ɺγεςϜΛަ׵͢Δͱ͖ʹ΋େ͖ͳॿ͚ͱͳΔɻ࣮ࡍɺॳظόʔδ ϣϯͷγεςϜͰͻͱͭ΍͓ͬͯ͘ͱྑ͍ͷ͸ɺ͋Δ΂͖࠷దͳϞδϡʔϧ ߏ଄ʹ͍ͭͯΑ͘ߟ͑Δ͜ͱɻަ׵ʹඋ͑ͯ஌ݟΛ஝͑Δ͜ͱɻ l ࢀߟɿ٘ਜ਼తΞʔΩςΫνϟ4BDSJGJDJBM"SDIJUFDUVSF IUUQTNBSUJOGPXMFSDPNCMJLJ4BDSJ
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೉͍͠໰୊͸Ͳ͜ʹ͋Δ͔ʁ Ϗδωε্ͷ੍໿ ૊৫తͳ੍໿ ΞʔΩςΫνϟཁ݅ʢ඼࣭ಛੑɾඇػೳཁ݅ʣ ΞʔΩςΫνϟཁ݅ʢ඼࣭ಛੑɾඇػೳཁ݅ʣ औΓ૊Ή΂͖໰୊΍༏ઌॱҐ

ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠ ͦͷͨΊɺ͢΂ͯͷܾఆ͸ɺଟ͘ͷ૬൓͢ΔཁૉΛߟྀ͠ͳ͚Ε͹ͳΒͳ͍ ᶃιϑτ΢ΣΞΞʔΩςΫνϟ͸͞·͟·ͳ΋ͷʹӨڹΛड͚Δɾ༩͑Δ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷݪଇ ⁞ Ϣʔβʔδϟʔχʔ͔Β͢΂ͯΛಋ͘   ΠςϨʔςΟϒͳεϥΠεઓུΛ༻͍Δ ⁠ ΠςϨʔγϣϯͰ͸ɺ࠷খͷ࿑ྗͰ࠷େͷՁ஋ΛՃ͑ɺΑΓଟ͘ͷϢʔβʔΛαϙʔτ͢Δ ⁡ ܾఆΛԼ͠ɺϦεΫΛෛ͏ ⁢
มߋ͕೉͍͠΋ͷ͸ɺਂ͘ઃܭ͠ɺΏͬ͘Γ࣮૷͢Δ ⁣ ࠔ೉ͳ໰୊ʹૣظʹฒߦͯ͠औΓ૊Ή͜ͱͰɺΤϏσϯεʹֶͼͳ͕Βະ஌ͷཁૉΛഉআ͢Δ ⁤ ιϑτ΢ΣΞΞʔΩςΫνϟͷڽूੑͱॊೈੑͷτϨʔυΦϑΛཧղ͢Δ ࠜఈʹ͋Δߟ͑ํ

ᶄιϑτ΢ΣΞγεςϜͷ։ൃʹ͸ෆ࣮֬ੑ͕ଘࡏ͢Δ ஌ͬͯͷ௨Γɺط஌ͷ஌ͱ͍͏΋ͷ͕͋Δɻ͜Ε͸զʑ͕஌͍ͬͯΔͱ஌͍ͬͯΔ͜ͱͩɻ ·ͨɺط஌ͷະ஌΋͋Δɻ͢ͳΘͪɺݱ࣌఺Ͱط஌Ͱͳ͍ͱΘ͔͍ͬͯΔࣄฑͩɻ ͔͠͠ɺະ஌ͷະ஌΋͋Δɻ͜Ε͸զʑ͕஌Βͳ͍ͱ͍͏͜ͱ͑͞஌Βͳ͍͜ͱͩɻ υφϧυɾϥϜζϑΣϧυ ໨ඪͷෆ࣮֬ੑʢຊ౰ʹ࡞Γ͍ͨ΋ͷ͸Կ͔ʣ ํ๏ͷෆ࣮֬ੑʢͲ͏΍ͬͯ࡞Ε͹͍͍ͷ͔ʣ l ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠

ᶄιϑτ΢ΣΞγεςϜͷ։ൃʹ͸ෆ࣮֬ੑ͕ଘࡏ͢Δ ஌ͬͯͷ௨Γɺط஌ͷ஌ͱ͍͏΋ͷ͕͋Δɻ͜Ε͸զʑ͕஌͍ͬͯΔͱ஌͍ͬͯΔ͜ͱͩɻ ·ͨɺط஌ͷະ஌΋͋Δɻ͢ͳΘͪɺݱ࣌఺Ͱط஌Ͱͳ͍ͱΘ͔͍ͬͯΔࣄฑͩɻ ͔͠͠ɺະ஌ͷະ஌΋͋Δɻ͜Ε͸զʑ͕஌Βͳ͍ͱ͍͏͜ͱ͑͞஌Βͳ͍͜ͱͩɻ υφϧυɾϥϜζϑΣϧυ ໨ඪͷෆ࣮֬ੑʢຊ౰ʹ࡞Γ͍ͨ΋ͷ͸Կ͔ʣ ํ๏ͷෆ࣮֬ੑʢͲ͏΍ͬͯ࡞Ε͹͍͍ͷ͔ʣ l ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠ ෆ࣮֬ੑΛͲ͏؅ཧ͢Δ͔ʁ

ΫωϏϯϑϨʔϜϫʔΫ$ZOFGJO'SBNFXPSL ෆ࣮֬ੑ͕͋Δঢ়گԼͰͷޮՌతͳҙࢥܾఆΞϓϩʔνͷܾఆΛࢧԉ͢ΔϞσϧ

ΫωϏϯϑϨʔϜϫʔΫ$ZOFGJO'SBNFXPSL ෆ࣮֬ੑ͕ߴ͚Ε͹ߴ͍΄ͲɺෳࡶܥͷΞϓϩʔνͷํ͕ ͏·͍֬͘͘཰͕ߴ·Δ ෆ࣮֬ੑ͕͋Δঢ়گԼͰͷޮՌతͳҙࢥܾఆΞϓϩʔνͷܾఆΛࢧԉ͢ΔϞσϧ

ᶃ୳ࡧʢ1SPCFʣҟͳΔҙࢥܾఆͷ݁ՌΛ؍࡯͢ΔͨΊʹ҆શͳ࣮ݧΛߦ͏ ᶄ೺Ѳʢ4FOTFʣೖखՄೳͳ৘ใΛऩू͠ɺؔ࿈͢Δࣄ߲Λಛఆ͠ɺύλʔϯΛଊ͑Δ ෳࡶܥͷঢ়گԼͰͷҙࢥܾఆʹ͓͚ΔޮՌతͳΞϓϩʔν ᶅରԠʢ3FTQPOEʣ࣮ݧͷ݁Ռʹैͬͯߦಈ͢Δ

IUUQTXXXTDSVNPSHSFTPVSDFTCMPHXIBUJUFSBUJWFJODSFNFOUBMEFMJWFSZIVOUQFSGFDUFYBNQMF ΠςϨʔςΟϒͳ։ൃϓϩηεͰ୳ࡧʔ೺ѲʔରԠαΠΫϧΛճ͠ͳ͕Β ໨తͱํ๏ͷෆ࣮֬ੑΛݮΒ͍ͯ͘͠

มߋ͕೉͍͠΋ͷ͸ɺਂ͘ઃܭ͠ɺΏͬ͘Γ࣮૷͢Δ ⁣ ࠔ೉ͳ໰୊ʹૣظʹฒߦͯ͠औΓ૊Ή͜ͱͰɺΤϏσϯεʹֶͼͳ͕Βະ஌ͷཁૉΛഉআ͢Δ ⁤ ιϑτ΢ΣΞΞʔΩςΫνϟͷڽूੑͱॊೈੑͷτϨʔυΦϑΛཧղ͢Δ

⁢ มߋ͕೉͍͠΋ͷ͸ɺਂ͘ઃܭ͠ɺΏͬ͘Γ࣮૷͢Δ ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ͭͷݪଇ w ηΩϡϦςΟͳͲɺιϑτ΢ΣΞΞʔΩςΫνϟͰ൑அ͕ඞཁͳҰ෦ͷྖҬʹͭ ͍ͯ͸ɺ࠷খݶͷϑΟʔνϟ͔Β࢝Ίͯগͣͭ͠ੵΈ্͍͛ͯ͘ͷ͕೉͍͠ྖҬ ΋ଘࡏ͢Δ w ͦ͏ͨ͠ྖҬʹରͯ͠͸ɺ໰୊Λे෼ʹղܾͰ͖ΔΑ͏ʹਂ͘ઃܭ͢Δ w
ͨͩ͠ɺෆ࣮֬ੑʹඋ͑ͯɺ࣮૷͸ඞཁͳ΋ͷʹߜͬͯΏͬ͘ΓͱਐΊΔ w ͦͯ͠ਐΊ͍ͯ͘தͰಘΒΕͨ஌ࣝΛ΋ͱʹదٓɺઃܭ΍࣮૷Λௐ੔͍ͯ͘͠

มߋ͕೉͍͠΋ͷ͸ɺਂ͘ઃܭ͠ɺΏͬ͘Γ࣮૷͢Δ ⁣ ࠔ೉ͳ໰୊ʹૣظʹฒߦͯ͠औΓ૊Ή͜ͱͰɺΤϏσϯεʹֶͼͳ͕Βະ஌ͷཁૉΛഉআ͢Δ ⁤ ιϑτ΢ΣΞΞʔΩςΫνϟͷڽूੑͱॊೈੑͷτϨʔυΦϑΛཧղ͢Δ

·ͱΊ

൑அྗͷෆ଍ͱ͸ɿ w ൑அͷࡐྉͱͳΔલఏ΍੍໿Λे෼ʹͱΒ͖͑Ε͍ͯͳ͍ w ൑அͷࡍʹߟྀ͢΂͖؍఺Λे෼ʹ໢ཏͰ͖͍ͯͳ͍ w ͦ΋ͦ΋ʮ൑அʯΛ͍ͯ͠ͳ͍ w ྲྀߦʹྲྀ͞Ε͍ͯΔʗݱ࣮Λݟͣʹ஌͚ࣝͩͷ൑அʹͳ͍ͬͯΔʗ૊৫ͷཁ੥ʹߟ͑ͳ͠ʹै͍ͬͯΔ ຊॻͷϞνϕʔγϣϯ
ιϑτ΢ΣΞΞʔΩςΫνϟͷࣦഊͷଟ͘͸ɺ஌ࣝෆ଍Ͱ͸ͳ͘൑அྗෆ଍ʹى͖͍ͯΔ ιϑτ΢ΣΞΞʔΩςΫνϟʹ͍ͭͯॻ͔Εͨॻ੶ɺҙࢥܾఆ΍Ϧʔμʔγοϓʹ͍ͭͯͷॻ੶͸ͦΕͧΕ ଟ͋͘Δ͕ͦΕΒ͕ॏͳΔॻ੶͕ඞཁͩͱߟ͑ͨ

ᶃιϑτ΢ΣΞΞʔΩςΫνϟ͸͞·͟·ͳ΋ͷʹӨڹΛड͚Δɾ༩͑Δ ᶄιϑτ΢ΣΞγεςϜͷ։ൃʹ͸ෆ࣮֬ੑ͕ଘࡏ͢Δ ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆ͸ͳͥ೉͍͔͠ ˠͭͷ໰͍Ͱߟྀ͢΂͖લఏ΍੍໿Λ໌Β͔ʹ͢Δ ˠͭͷݪଇʹԊͬͨΞϓϩʔνΛऔΔ͜ͱͰෆ࣮֬ੑΛ؅ཧ͢Δ

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ w ͦͷ࣌఺ʹ͓͚Δ੍໿ɾલఏΛཧղ͢ΔͨΊͷͭͷ໰͍ w ద੾ͳ൑அͷ࣠ͱͳΔͭͷݪଇ w े෼ͳߟྀͷͨΊͷͭͷ؍఺ ιϑτ΢ΣΞΞʔΩςΫνϟͰݕ౼ͨ͠ํ͕ྑ͍τϐοΫʢͭͷ؍఺ʣ͝ͱʹɺͲͷΑ͏ͳ લఏɾ੍໿Λߟྀͨ͠ํ͕Α͍͔ʢͭͷ໰͍ʣɺͲͷΑ͏ʹਐΊ͍ͯ͘ͱΑ͍͔ʢͭͷݪ ଇʣͱ͍ͬͨҙࢥܾఆͷΞυόΠε͕ॻ͔Ε͍ͯΔ
ෆ࣮֬ੑΛ؅ཧ͠ͳ͕Βɺ૬൓͢Δ͞·͟·ͳཁૉΛߟྀ͠ͳ͕Βɺ ιϑτ΢ΣΞΞʔΩςΫνϟͷҙࢥܾఆΛଓ͚͍ͯ͘ͷʹ໾ཱͭಓ۩Λఏڙ

5IF3PNBO$PMJTFVNJT/05"SDIJUFDUVSF5IF3PNBO$PMJTFVNJT UIF3&46-5PG"SDIJUFDUVSF +PIO";BDLNBOʮ"SDIJUFDUVSFJT"SDIJUFDUVSFJT"SDIJUFDUVSFʯ l ϩʔϚɾίϩοηΦ͸ΞʔΩςΫνϟͰ͸ͳ͍ɻϩʔϚɾίϩοηΦ͸ΞʔΩςΫνϟͷ݁Ռͩɻ IUUQTXXXCSDPNNVOJUZDPNBSUJDMFTQIQ JEC

ιϑτ΢ΣΞΞʔΩςΫτͷͨΊͷҙࢥܾఆज़ 4PGUXBSF"SDIJUFDUVSFBOE%FDJTJPO.BLJOH ౡాߒೋ !TOPP[FS 'PSLXFMM-JCSBSZ ENISHI TECH INC.

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ソフトウェアアーキテクトのための意思決定術: Software Architecture and Decision-Making

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