In this year, 2018, we celebrate 50 Years of Forth. How do you define a computer language? Charles Moore, the inventor of Forth, takes you through the different steps and as well through the reasoning behind it. This is an early book and with the 50 Years Of Forth, this eBook, available for 4 years, will now be made available as print book as well. It is part of the Forth Bookshelf at amazon, see https: //www.amazon.co.uk/Juergen-Pintaske/e/B00N8HVEZM .