An analysis of several success factors in analog/mixed signal/RF ASIC design and manufacture turned up a number of interesting facts. There were many reasons for success that have been already described elsewhere in this blog. However, the interplay of relationships and their impact on the success of ASIC design and development was not touched. Much to our surprise the analysis of over 100 ASIC projects executed in SPG indicated that when significant success was achieved, not only were the obvious success factors present ( see the blog entry) but a key factor was the customer interface. (1) The customer interface was a technical person who was really closely involved in the design from the system side; (2) the technology that was being used to implement the ASIC was an excellent fit to the requirements; (3) the fabrication vendor relationship was strong and close with SPG; then the probability of clear success was over 99% (conservatively). We did not find a single failure in our list of 100 projects when these conditions were also met. ( In addition to the success factors quoted elsewhere in this blog. The very first entry in the blog since its inception). Thus the objective of this entry is to add this success factor to the list. The search for success in the analog/mixed signal/RF ASIC design and development is critical for our success.