ͦ ӡ ༻ ͠ ͳ ͘ ͯ ྑ ͍ • ʮͦͷػೳɺຊʹඞཁͰ͔͢ʁʯ • ͋Ε͍͍͍͍ͩͨΘͳ͍ • Only 10% of that extra stuff will ever get used, so you are wasting 90% of your time. • ޙͰ͏ͩΖ͏ͱ͍͏༧ଌͷݩʹ࡞ͬͨͷɺ࣮ࡍʹ10%ఔ͔͠ΘΕͳ͍ɻ ͕ͨͬͯ͠ɺͦΕʹඅͨ࣌ؒ͠ͷ90%ແବʹͳΔ • YAGNI ( You ain’t gonna need it ): ͦΜͳͷඞཁͳ͍ͬͯ