Editing The Mythical Man-Month (section)

=== Project estimation ===
When estimating project times, it should be remembered that [[programming product]]s (which can be sold to paying customers) and programming systems are both three times as hard to write as simple independent in-house programs.<ref>[https://www.amazon.com/gp/reader/0201835959 The Mythical Man-Month] Figure 1.1, Page 13</ref> It should be kept in mind how much of the work week will actually be spent on technical issues, as opposed to administrative or other non-technical tasks, such as meetings, and especially "stand-up" or "all-hands" meetings.