Article 4
1. The development plan provided for in Article 2 (1) (d) must show that, upon its completion, the farm undergoing modernization will be capable of attaining as a minimum, in principle for either one or two man-work units, a level of earned income comparable to that received for non-agricultural work in the region in question. 2. A comparable earned income as referred to in paragraph 1 means the average gross wage for a non-agricultural worker. Member States may, where necessary, take account of disparities between the social security arrangements for farmers and those for non-agricultural workers. 3. For the purpose of showing that the farm undergoing modernization will be capable of attaining the objective referred to in paragraph 1, the earned income to be attained upon completion of the development plan shall be compared either: - with the comparable earned income as defined in paragraph 2, or - with that of reference farms which at the time when application is made have an earned income equivalent to the comparable income as defined in paragraph 2. 4. Member States (a) shall: - specify the minimum number of man-work units, having regard to the various types of production and to the working conditions associated therewith; - determine what constitutes an adequate return on the capital invested in the farm business; - fix, having regard to the duration of the development plan, the modernization objective referred to in paragraph 1; (b) may provide that up to a specified percentage of the earned income to be attained upon completion of the development plan may consist of income arising from non-agricultural activities, so long as the earned income derived from the farm business is at least equal to the comparable earned income for one man-work unit. The percentage specified may not exceed 20 %. 5. Upon completion of the plan, the level of income referred to in paragraphs 2 and 3 must be attainable by means of an annual working period not exceeding 2300 hours. 6. The achievement of the objectives of the development plan may be spread over a maximum of six years. However, Member States may be authorized, under the procedure laid down in Article 18, to specify a longer period for certain regions.