The normal time day is not however sufficient to establish a just balance between performance of work and payment; for in an hour of the same industrial time value, one individual will work less, another more, one better, another worse. The combined interests of the whole community and the equitable wage relations of the different workers to each other, demand therefore the fixing of the normal performance of labour within a defined working time, in short the fixing of a unit of normal work. Having normalised industry on a _time_ basis, we must now normalise it on a _work_ basis. And this is how _Rodbertus_ proposes to do it: According as the normal _time_ labour-day has been fixed in any trade at 6, 8, 10, or 12 hours (in proportion to the arduousness of the work, etc.), the normal amount of work of such a day must also be fixed for that trade, _i.e._ the amount of work must be determined which an average workman, with average skill and industry, would be able to accomplish in his trade during such a normal time labour-day. This amount of work shall represent in any trade the normal amount of work of a normal _time_ labour-day, and therewith shall constitute in any trade the normal _work_ labour-day, which would be equal to what any workman must accomplish within the normal _time_ labour-day of his trade, before he can be credited with and paid for a full day, that is, a normal _work_ labour-day. Hence if a workman had accomplished in a full normal _time_ labour-day, either one and a half times the amount, or only half the amount of normal work, he would _e.g._ in the six hours mining day, for six hours work, be credited with a day and a half, or half a day respectively of normal work time; whilst in spinning and weaving, on the other hand, he would in the same way, for 12 hours work, be credited with one and a half or a half-day respectively of normal work time.