So i am going to post my own observations which people are more than welcome to disagree with. Across a number of lineages there are similarities and differences in the forms and applications. With regard the similarities, most accept that they are wing chun. With regard the differences there is contention. From what i have learnt, i am able to recognise across a number of lineages some differences which are in my own art... But that is what i can see from my part of the jigsaw, not all just some. There seems to be two approaches, those who say that the pieces of the jigsaw they have are the entire art, and those say they have some of the pieces but that there is more out there. Of the latter group some seem to look outside wing chun to fill the gaps and others embark on a game of jigsaw poker, unwilling to reveal what they have but wanting to know what the others do. i fall into this last category.