The   AMT   workshop   series   brings   together   researchers   and   practitioners   interested  in  the  analysis  of  model  transformations  in  the  area  of  model  driven   engineering.   The   4th   edition   took   place   on   28   September   2015   and   was   co-­located  with  MODELS'15  in  Ottawa,  Canada.     Out  of  the  10  papers  submitted  and  reviewed  by  at  least  three  members  of  the   program  committee,  7  were  selected  for  presentation.       In   addition   to   the   presentation   of   the   selected   papers   from   the   technical   program,  AMT'15  featured  an  invited  presentation  by  Edward  Willink  (Willink   Transformations   Ltd.,   UK)   and   Nicholas   Matragkas   (University   of   York,   UK)   entitled  “QVT  Traceability:  What  does  it  really  mean?”.     The   workshop   also   had   a   keynote   by   Manuel   Wimmer   (Vienna   University   of   Technology,  Austria)  entitled  “Search-­‐based  Model  Transformation  Analysis”.     This  volume  contains  versions  of  the  selected  papers  that  the  authors  had  the   opportunity  to  revise  by  taking  into  account  reviewers'  comments.     We   are   grateful   to   all   authors,   attendees,   program   committee   members,   external  reviewers  and  local  organizers  for  helping  make  AMT  2015  a  success.         October  15,  2015