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Have you planned your project? Project planning will identify your resource needs. If the Product Specifications are developed, look through the functions shown to make sure you have everything covered. The Product Specifications provide overriding constraint of all development. However, each development function is also governed by the adjacent development. In other words: ECB is governed by both the Mechanical and Electronic requirements. Electronics are governed by the Firmware and ECB constraints. Firmware is governed by the Software and Electronic interfaces.