To someone outside the fold one of the problems with Evangelicalism is that there are so many varieties! Conservative Evangelicalism, Charismatic Evangelicalism, and Open Evangelicalism.
Whilst studying I can across the Bebbington Quadrilateral as a definition of Evangelicalism, although there is criticism of it.
Fulcrum are a UK based Open Evangelical organisation and this is how they define the Evangelical Centre. There are also groups like Reform who would hold a more conservative position and New Wine, a more Charismatic one.
I hope I have done justice to the descriptions.