Page 6 of the report presents the ideas of the Vw-grammar. Protonotions, Notions, Metanotions, Hypernotions, Paranotions, Symbols, Productions and Production Trees are introduced to explain the grammar! I encourage readers to take a peek at almost any paragraph of the 70 page Algol 68 report and compare it to the The Programming Language Pascal Revised Report by Wirth [2],[3]. It's easy to see why Pascal became quite popular and Algol 68 never did.
Despite the fact that Algol 68 was too difficult to compile efficiently at the time, it introduced a number of features we take for granted today. See Richard Hamlet's Ignorance of Algol 68 Considered Harmful, [4].
On a personal note, I was a young Computer Scientist at the time these reports were published, and I miss how easy it was back then to keep up with the research that was going on at the time. Today it's impossible to be a generalist. So many independent and important branches have sprouted off the trunk of CS that everyone is a novice in major parts of the field.
[1] ACM SIGPLAN Notices, Volume 12, Issue 5, May 1977 pp 1–70, https://doi.org/10.1145/954652.1781176
[2] http://standardpascaline.org/The_Programming_Language_Pascal...
[3] https://www.amazon.com/Pascal-User-Manual-Report-Standard/dp...
[4] ACM SIGPLAN Notices, Volume 12, Issue 4, April 1977 pp 51-56, https://doi.org/10.1145/954654.954659