No Aircraft
Confusion; Workload
No Specific Anomaly Occurred All Types
General None Reported / Taken
Chart Or Publication; Company Policy; Procedure
All RNAV departures SHOULD have a top altitude box in bold on the top of the chart.  Trying to find the top altitude can be irritating; time consuming; and can; in some instances; create misleading information.The SNOBL 2 RNAV in PHX is one example.  In clear bold print on the chart you see an 'at or below 9;000'; however; if you search in the fine print of the routing box you notice a 'maintain 8;000.'  VERY POOR DESIGN that has the possibility of being set incorrectly on the departure and possibly result in a possible mid-air collision.CHANGE all departures that have a 'Climb Via' top altitude on chart to a bold boxed 'Top Altitude' in the same position on chart.
An air carrier pilot commented that standard RNAV design; such as the PHX SNOBL 2; should have a clear bold top procedure clearance altitude (8;000 feet) depicted on the chart to prevent confusion with higher constraints (9;000 feet) in bold print.