Knowledge management, which is very simplified by the IT introduction, is seen in the organisation as a means for the best management of the intellectual capital. As knowledge has become both a support and an important factor of the organisational change, the IT’s interest lies in the capacity of generating an important interactive base of knowledge which is easy to access and to exploit. In this thesis, we study the adoption of knowledge management as a new approach for the management of organisations in Algeria. Our problematic is turned towards the organisational value creation, which results in performance improvement. The specificity of our research’s object is dealt through a qualitative methodology. The originality of this work is to take into account two analysis levels: the global level and the organisations level. To study the global level, we lead an approach to understanding the application of a strategy of knowledge management in an electronic governance project in Algeria. We study the organisations level through a multi-case study, to look for regularities, divergences and convergences between the elements of the different studied cases. The objective of this research, which is essentially exploratory, lies within the framework multidimensional analysis to understand and explain the qualitative relations which characterize the phenomenon we are studying.