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Theoretical studies of the processes in multielectron atoms under the exposure of strong electromagnetic fields is intensively developed subject in laser physics. Many interesting features of these processes are difficult to be reproduced by means of the existing theoretical methods. It concerns, for example, the effects of electron–electron correlations in multiple photoionization. In light of the progress in this area for weak and strong fields it may be of interest to develop a method equally efficient for a wide range of field strengths. In this paper the capability of a new trajectory-based method, which works in a wide range of field strengths and reproduces effects attributed to electron–electron correlations, is demonstrated for single- and double-photoionization in helium atom. [ABSTRACT FROM AUTHOR]