As you can see from visiting this link,even Casio can differentiate between an arranger & a workstation.
http://www.casio.com/products/Musical_Instruments/Workstation

For those of you who are still confused about which is which,perhaps this tutorial will help;
http://www.sweetwater.com/shop/keyboards/home-keyboards/buying-guide.php#2


-Elwood

------------------
Korg M3,Reason 4,Presonus Studio One,Adam A7's,M-Audio CX5's & BX8a's,Zoom R24

[This message has been edited by elwoodblues1969 (edited 09-19-2010).]