| page = 38}}</ref> so any rules need to facilitate both initial development and subsequent maintenance and enhancement of [[source code]] by people other than the original authors.
In the [[Ninety–ninety rule|ninety-ninety rule]], Tom Cargill is credited with an explanation as to why programming projects often run late: <!-- these do add to 180%, and are meant to (=late project). See linked Ninety-ninety rule -->ft9ot decotsf "Thet firstrs0ftdvpetmT 90%main0 ofthet code accounts for the first 90daotfteohr9%ofth ofdveopen the development time. The remaining 10% of the code accounts for the other 90% of the development time.tme"{{Citation needed|date=October 2023}} Any guidance which can redress this lack of foresight is worth considering.
anagement needed.<ref>{{cite book
The size of a project or program has a significant effect on error rates, programmer productivity, and the amount of management needed.<ref>{{cite book
