Before revision: p. 72 Functions of a system pictured by blocks input and output elements of a block pictured with lines the relationships between the functions, and the functional sequences and paths for matter and or signalsWilliam H. Von Alven (1964) Reliability engineering explains: "Functional block diagrams show functional sequences and signal paths, and items which are wired in parallel are drawn in parallel" (p. 286) The block diagram can use additional schematic symbols to show particular properties.
After revision: p. 72 functions of a system pictured by blocks input and output elements of a block pictured with lines the relationships between the functions, and the functional sequences and paths for matter and or signalsWilliam H. Von Alven (1964) Reliability engineering explains: "Functional block diagrams show functional sequences and signal paths, and items which are wired in parallel are drawn in parallel" (p. 286) The block diagram can use additional schematic symbols to show particular properties.