With the ever-increasing drive for miniaturization, microjoining is critical to the successful performance of assemblies in a wide variety of industries. These include medical products, electronics, telecommunications, defense, automotive, aerospace, and power generation, and cover a wide range of microjoining applications. The increasing complexity and miniaturization of devices used by these industries demands sophisticated joining processes with low defect rates as they strive to decrease the size of their assemblies whilst increasing performance. This article defines microjoining, the processes commonly used and some of the issues concerned with joining very small components. In recognition that worldwide there is strong growth in the requirement for miniaturized assemblies by these many diverse industries, CSIRO in Adelaide, South Australia commenced a new Microjoining initiative. This article then describes some of the work that has so far been conducted.