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Variations and Further Work 7.1 Any variations or further work to be undertaken by Horizon pursuant to any subsequent commission shall be jointly agreed between the parties and shall be set out in a written proposal describing: 7.1.1 the nature of such work; 7.1.2 the time schedules pursuant to which such work will be undertaken and completed; 7.1.3 the time and other resources which Horizon will devote to such work; 7.1.4 the amount and/or method of calculation of the fees of Horizon for such work. 7.2. Further work shall be carried out on a time and materials basis and will be charged at S$1,200.00 per man day plus out of pocket expenses.