UT1 and UT2 will receive instruments developed both by ESO and consortia. On the present schedule until beginning 2000, two instruments are being developed by consortia (CONICA, FORS I + II). UVES and ISAAC/SOFI will be realised by ESO. The development effort concerning reduction software for the already planned future (until 2000) will be about 50% for internal development and 50% in the consortia. Later will come a series of externally developed instruments (FUEGOS, VIRMOS, VISIR).
Astronomical institutes may be contracted for the development of the software for external instruments. Reduction Recipes will developed by the consortia in relation with the Instrument Responsible and the Data Analysis Specialist.