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30 SMT007 MAGAZINE I AUGUST 2021 Feature Article by Charles Capers ZENTECH DALLAS For the past several decades, OEMs have used outside EMS providers to build a multi- tude of products from PCBAs to complete box and cable assemblies. Communicating effec- tively is the key to success in getting prod- ucts from concept to reality. For companies that want to form a good working relationship with EMS providers, there are several steps that should be followed to ensure a successful product build. is is especially true if you are working with suppliers in different parts of the world. is article will focus on effective com- munication methods between the OEM and EMS provider and discuss some very simple ways to avoid some of the pitfalls associated with outsourced services. Statement of Work (SOW) e SOW is a very common document in the military and aerospace side of the electron- ics manufacturing world. e SOW spells out exactly what the customer expects from the supplier. Details will include specifications to adhere to, ITAR restrictions, flow-downs, revi- sion levels, quality notes, deliverables, report- ing requirements, FAI requirements, and any other special instructions not found in any other documentation. On the commercial side of the fence, SOWs are generally non-existent and it's up to the EMS provider to piecemeal all the instructions together from a multitude of email notes and instructions. Inevitably, something will get missed and/or will not be communicated to the shop floor. Basically, the SOW defines the rules of engagement. Apart from a detailed SOW, a complete input package is the most important part of the quote and build process and should include as much information as possible. is will allow the EMS provider to produce an accurate quote and identify any possible areas of concern. Input Package Organization is the key to a good input pack- age. A concise input package should include, but is not limited to the following items: • BOM (Excel format) • Output data (IPC-2581, ODB++, Gerber, IPC-D-356 netlist, X-Y data, etc.) • Fabrication drawings (PDF or DXF) • Assembly drawings (PDF or DXF) • Test requirements • Project notes Communicating Effectively with EMS Providers