Due to popular demand we thought it would be rude not to update last year's review of the top 20 automotive engine families. Like vehicle manufacturing, the engine manufacturing sector is under pressure to maximise economies of scale by using common components and modules. Where vehicle manufacturers look to develop vehicles using a common 'platform' or architecture, engines belong to families, which employ a similar construction. Defining what makes a group of engines a family can be just as subjective as defining platforms, if not more so. PricewaterhouseCoopers AUTOFACTS compiles databases of engine manufacture to a high level of detail and conducts analysis based on these data, which includes engine family characteristics, and it is their data that we have come to rely on to present a concise overview of the sector in this management briefing.