This thesis investigates whether the financial and non-financial performance of organizations is influenced bye-business strategy planning. Four strategic planning parameters of Formality, Participation, Sophistication and Thoroughness are examined when applied to e-business strategy planning. We try to establish if relationships exist between these parameters and Financial and Non-Financial Performance, and if so we examine the directions of these relationships. A conceptual model has been constructed and quantitative research methods are used to test the four hypotheses. The model was tested in two EU countries, the United Kingdom and Greece. The conclusions of this research study, including numerical results and statistical analysis, show that in both countries Participation has a positive relationship with Financial Performance. Furthermore, Formality has a positive relationship with Non-Financial Performance. In Greece, all of the independent variables of Formality, Participation, Sophistication and Thoroughness were found to have a positive relationship with Financial and Non-Financial Performance. In the UK, Participation had a positive relationship with Financial Performance and Formality had a positive relationship with Non-Financial PerfOlmance. This research study brings together elements of e-business strategy planning, strategy planning and performance management. It demonstrates . how strategy planning components have a positive relationship with e-business strategy management and performance. It is also shown that this model is extendable and valid in countries other than the UK, thus being able to be easily adapted to and used in other national environments.