Grateful acknowledgement is made to the following sources:

Every effort has been made to contact copyright holders. If any have been inadvertently overlooked the publishers will be pleased to make the necessary arrangements at the first opportunity.

Important: *** against any of the acknowledgements below means that the wording has been dictated by the rights holder/publisher, and cannot be changed.

The Johnson/Smith family:

266470: Jazmin (top left): tommaso79 / iStock / Getty Images Plus

266472: Steve (top right): tommaso79 / iStock / Getty Images Plus

266477: Jaden (bottom left): Ridofranz / iStock / Getty Images Plus

266476: Chloe (bottom right): JBryson / iStock / Getty Images Plus

Introduction to the Johnson/Smith family case study