September 2011
Intermediate to advanced
612 pages
15h 48m
Japanese
Content preview from Making Software ―エビデンスが変えるソフトウェア開発
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190
11
章 コンウェイの法則の系
可能であれば、正確性と再現性の双方を最大にしたいわけです。理想的な予測指標は、すべての実際
にエラーが起きやすい傾向にあるバイナリをそうとして予測し、その他のものはいっさいエラーが起き
やすい傾向にあるとは予測しないようなものです。表
11-1
に、組織構造の回帰モデルの再現性と正確
性を、ソースコードの特徴を用いて予測するこれまでに使われて来た手法と比較して示します。
表
11-1
予測の正確さ
モデル 正確性 再現性
組織構造
86.2% 84.0%
コード変更量
78.6% 79.9%
コードの複雑さ
79.3% 66.0%
依存関係
74.4% 69.9%
テストカバレジ
83.8% 54.4%
リリース前のバグ
73.8% 62.9%
帰結
これらの結果が実際に意味するものは何でしょうか？まず、
Windows Vista
の開発というコンテキ
ストでは、組織構造の複雑さがリリース後の欠陥と強い関係があることは明らかです。これらの結果は
（少なくとも
Windows Vista
開発のコンテキストでは）、コミュニケーションとコーディネーションが
技術上の成果物に対応しているときに、ソフトウェアはより「良く」なる、というコンウェイの法則の
系を裏付けます。異なる組織の開発者たちが共通のバイナリに対して作業するとき、そのバイナリはエ
ラーが起きる傾向が強まります。このことに対する説明はいろいろ考えられます。技術者が開発を去っ
た場合は、バイ
ナリ固有のドメイン知識が失われますし、主所有の深さが小さいなら、同じバイナリに ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.