Billy Mitchell (EastEnders) revealed in 2006 that the role was extended by "coincidence and chance": "I was offered four episodes and here I am, about 800 later. [...] Ross Kemp (Grant) said that he was leaving, and there was a gap in the Mitchell family, so they brought me back to do stuff towards his leaving. After that they offered me a year." Billy was reintroduced in 1999, making recurring appearances. He was involved in the leaving storyline of Grant Mitchell in October 1999, before returning later in the year as a regular character. When Billy was first introduced, he was depicted as
Jerrold Kemp of the model This book has over 1400 citations on Google Scholar: Morrison, G. R., Ross, S. M., Kemp, J. E., & Kalman, H. (2010). Designing effective instruction. John Wiley & Sons. Other books and publications include: Kemp, J. E., & Cochern, G. W. (1994). Planning for Effective Technical Training: A Guide for Instructors and Trainers. Educational Technology. Kemp, J. E. (1980). Planning and producing audiovisual materials (No. Ed. 4). Harper & Row. Kemp, J. E. (1996). School Restructuring: Your School Can Do It!. Techtrends, 41(1), 12-15. Kemp, J. E. (1971). Instructional Design; A Plan for Unit and Course Development.