Directions:

By plane:
At the airport 'Stuttgart Echterdingen' change to the subway line 'S2' or 'S3', direction 'Stuttgart Hauptbahnhof'. Get off after ~27 minutes at stop 'Stuttgart Hauptbahnhof'.  Continue as described under 'by train.

By train:
Get off at 'Stuttgart Hauptbahnhof' and change to subway line 'U6', direction 'Gerlingen'. Get off after ~25 minutes at stop 'Siedlung'. Walk the platform against direction of arrival, cross the road (not the subway track) and follow the 'Benzstrasse' rectangular to the track for 100m. The building on the right side at the next crossing is the CoreOptics office Stuttgart.

By car:
Get off the A81/E54 at exit  18 'Stuttgart-Feuerbach' and follow directions.