Submitted as an invited paper for the first issue of the SDPS journal, at request of Prof. Atila Ertas, editor. The journal is published in Austin, Texas, by the SDPS society. ABSTRACT: …those large systems that depend on both technology and people as key components (the sociotechnical systems) are unsatisfactory….A new platform for sociotechnical system design is presented, which is intended to reorient the system designer and system design practice. This new platform, from which sociotechnical system design activity can be confidently launched, can be described as five-dimensional. The dimensions are: Human behavior, science, communication, modeling, and complexity… This paper is one of the group of seven manuscripts which Warfield has included in his IASIS monograph titled "1997 Essays on Complexity (Mid-Year Edition)" which he assembled and printed in June 1997, and also it was part of "Essays on Complexity, Review Copy," dated August 1997, which was printed and distributed to a number of colleagues. The published version finally appeared, in November 1997. The publisher does not provide any reprints for sale, so we had to make photocopies to distribute to colleagues.