Pumping and recovery test data in phyllite formations were analysed under linear flow conditions by incorporating modification in the method proposed by Şen (1986). Although the Şen (1986) method is developed for analysis of borewell test data, this method has been used for large-diameter well-test data by taking average inflow rate in the well. The results obtained were compared with Şen's graphical method. Lower values of root mean-square error were obtained by least-squares method. The estimated values of transmissivity and storage coefficient were acceptable at 1 per cent level of significance. An advantage of the least-squares method is the automization, which is lacking in the graphical method utilising curve-matching technique.

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