Ralf Carbon Jens Knodel Dirk Muthig Gerald Meier Providing Feedback from Application to Family Engineering - The Product Line Planning Game at the Testo AG. 180-189 2008 SPLC http://dx.doi.org/10.1109/SPLC.2008.21 conf/splc/2008 db/conf/splc/splc2008.html#CarbonKMM08