Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Takaddun shaida don ƙirar ƙira ya bayyana mahallin da ake amfani da ƙirar, da ƙarfin da ke cikin mahallin da ƙirar ke neman warwarewa, da kuma shawarar da aka ba da shawara. Babu guda, daidaitaccen tsari don yin takaddar ƙirar ƙira. Maimakon haka, an yi amfani da nau'ikan tsari daban-daban ta hanyar marubuta daban-daban. Koyaya, a cewar Martin Fowler, wasu siffofin tsari sun zama sanannu fiye da wasu, kuma sakamakon haka sun zama wuraren farawa na yau da kullun don sabbin ayyukan rubutu. Misali na tsarin da aka saba amfani da shi shi ne wanda Erich Gamma, Richard Helm, Ralph Johnson, da John Vlissides suka yi amfani da shi a cikin littafin su Design Patterns. Ya ƙunshi sassan da ke gaba:  Tambaya: Mene ne tsari don rubuce-rubuce na zane-zane?
mahallin da aka yi amfani da tsarin, da karfi a cikin mahallin da tsarin ke neman warwarewa, da kuma shawarar da aka ba da shawara