Amortisation and depreciation for the period, divided by category, is shown below:

Property, plant and equipment 20112010Change
In thousands of Euro      
Buildings 4,095 4,044 51
Plants and machinery 14,075 13,479 596
Industrial and commercial equipment 15,198 16,392 (1,194)
Other assets 1,851 1,964 (113)
Total depreciation of tangible fixed assets 35,219 35,879 (660)
Intangible assets 2011 2010 Change
In thousands of Euro
Development costs 28,315 26,362 1,953
Industrial Patent and Intellectual Property Rights 21,512 13,990 7,522
Concessions, licences, trademarks and similar rights 9,039 9,038 1
Other 928 737 191
Total amortisation of intangible fixed assets 59,794 50,127 9,667

As set out in more detail in the paragraph on intangible assets, as of 1 January 2004, goodwill is no longer amortised, but tested annually for impairment.
The impairment test carried out as of
31 December 2011 confirmed the full recoverability of the amounts recorded in the financial statements.