Challenges, solutions and future directions in the evaluation of service innovations in health care and public health oleh Rosalind Raine, Ray Fitzpatrick, Helen Barratt, Gywn Bevan, Nick Black, Ruth Boaden, Peter Bower, Marion Campbell, Jean-Louis Denis, Kelly Devers, Mary Dixon-Woods, Lesley Fallowfield, Julien Forder, Robbie Foy, Nick Freemantle, Naomi J Fulop, Elizabeth Gibbons, Clare Gillies, Lucy Goulding, Richard Grieve, Jeremy Grimshaw, Emma Howarth, Richard J Lilford, Ruth McDonald, Graham Moore, Laurence Moore, Robin Newhouse, Alicia O’Cathain, Zeynep Or, Chrysanthi Papoutsi, Stephanie Prady, Jo Rycroft-Malone, Jasjeet Sekhon, Simon Turner, Samuel I Watson, Merrick Zwarenstein