[3] CAD software is easier to use and is available in full-featured expensive packages, very capable mid-range packages that sometimes have free versions and completely free versions that are either open source or directly linked to a printed circuit board fabrication company.
Readability levels can be enhanced by using buses and superbuses, related pins can be connected into a common bus and routed to other pages.
Schematic capture involves not only entering the circuits into the CAD system, but also generally calls for decisions that may seem more appropriate for later in the design, such as package choice.
However, in a rapid prototyping environment such as at assembly houses specializing in low-volume/high-mix and quick turnaround times, the pick and place machines are programmed directly from the board layout files.
Careful package selection during schematic capture will save time during the assembly and debug process.