Joel Spolsky

Avram Joel Spolsky is a software engineer and writer. He is the author of Joel on Software, a blog on software development, and the creator of the project management software Trello. He was a Program Manager on the Microsoft Excel team between 1991 and 1994

Painless Software Schedules https://www.joelonsoftware.com/2000/03/29/painless-software-schedules/