This book analyzes what happens to the pension benefits of workers who quit or are laid off jobs. The first chapter reviews the connection between job mobility and pension portability. Chapter 2 portrays a labor market undergoing changes that often result in reductions in retirement benefits. Chapter 3 describes job change further by examining data on workers by industry and the particular impact of mobility on women's pension benefits. Chapter 4 investigates size of consequent losses. Chapter 5 examines receipt and subsequent use of preretirement lump sum distributions. Chapter 6 discusses issues concerning the pension benefits of laid-off workers. Chapter 7 describes pension plan features that already reduce portability losses. Chapter 8 debates the pros and cons of pension portability reform in five areas: equity, tax and budget policy, regulation, economic effects, and financial responsibility. Chapter 9 describes and evaluates policy options designed to reduce portability losses. Chapter 10 examines how policies mandating portability would affect employers and workers and surveys studies relating pensions and job change. Chapter 11 examines the role of layoffs in portability losses. Chapter 12 discusses policies toward pension portability in Canada, Japan, the Netherlands, and the United Kingdom. Chapter 13 concludes the book with a selective list of policies that would reduce the pension benefit losses of job changers. (Appendixes include an index.) (Contains 164 references.) (YLB)