Slides from a presentation given by Paul Turner to meetings of IIBA UK on 16 July and 12 August 2014. Much has been written about technical and solution architectures, without due attention being given to how these work together with the Business Architecture. It is easy to believe that those who are involved in business analysis, requirements definition and systems modelling do not need to consider the Business Architecture at all. This could not be further from the truth. This talk explains the rationale behind Business Architecture, what its main components are and why Business Analysts should ensure that they understand it and the influence it is likely to have on their work.