This report, the first of a series on productivity and job security, presents five case studies to illustrate retraining to achieve worker's adjustment to technology. The first of seven chapters addresses the following issues: the availability of job training/retraining data, the desirability of informing workers in advance of technological change, advantages/disadvantages of training methods, and the general effectiveness of retraining to assure job security. The first case study, presented in chapter 2, discusses the removal of foundry worker's apprehensions about moving into a new foundry through on-the-job training (OJT) and assurances that job declines would be met through attrition. Chapter 3 examines a case in which single craft mechanics were transformed to multicraft personnel through OJT and home study. The fourth chapter contains a case in which graphic arts innovations and employer attitudes resulted in mature worker's layoffs. Chapter 5 discusses the use of simulation to upgrade welders' skills. Chapter 6 recounts a case in which Detroit retrained building inspectors. The importance of continuing education and training are emphasized in chapter 7. This final chapter formulates policy implications and suggests that efforts to achieve high productivity through technology is generally accepted by unions provided companies pursue a job security policy. (Other reports in this series are also available--see note.) (CSS)