For those interested:
ICAO Doc 8168 or "Procedures for Air navigation services" consists of two volumes.
Volume 1, called
"Flight Procedures" is the foundation for all IFR operation. And it is
mandatory read for all pilots.
From the forewords of Doc 8168:
Volume I — Flight Procedures describes operational procedures recommended for the guidance of flight operations personnel and flight crew. It also outlines the various parameters on which the criteria in Volume II are based so as to illustrate the need to adhere strictly to the published procedures in order to achieve and maintain an acceptable level of safety in operations.
MarkerInbound, volume II is "Construction of Visual and Instrument Flight Procedures"...
Volume II — Construction of Visual and Instrument Flight Procedures is intended for the guidance of procedures specialists and describes the essential areas and obstacle clearance requirements for the achievement of safe, regular instrument flight operations. It provides the basic guidelines to States, and those operators and organizations producing instrument flight charts that will result in uniform practices at all aerodromes where instrument flight procedures are carried out.
...and as can be seen in italic it is not essential read for pilots.