ecolearn is the first e-learning provider to offer all learning modules in the Training catalogue of the energy efficiency expert list have been included. The online learning modules "The passive house standard", "Airtightness of the building envelope", "Fundamentals of ventilation technology" and "Calculation of economic efficiency" are each provided with 6 teaching units in accordance with the standard booklet/training catalogue for registration or renewal of the entry in the list of energy efficiency experts. Proof of completion of the individual learning modules is provided by means of a final online test. After successfully completing the test, participants receive a confirmation with the corresponding training code. This confirmation can then be submitted to the Energy efficiency experts be submitted.