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Ahhh....(sound of forehead smack)

Thank you all for the help!

Forgive me if I misunderstand: I have actual (observed)quarterly data for the interval 1999Q1 to 2009Q3. I know the data exhibits seasonality just by inspection. My goal is to: 1) quantify the seasonality, and 2) forecast the data for the next 4 quarters into the future 2009Q4, 2010Q1, 2010Q2, 2010Q...

trubador- THanks for responding. I don't seem to be doing it right then: 1) I open a series called spa containing 43 quarterly observations, 1999Q1 to 2009Q3. 2) I open Proc>Exponential Smoothing> 3) From the dialogue box I select: Smoothing Method=Holt-WInters Multiplicative; Smoothing Parameters=E...

Question from a newbie:
How do I get the Holt-WInters smoothing option to forecast m-periods beyond the end of my data range?

Thanks in advance...