存在这样的实际需求，需要提高对功能和驻留在现有遗留系统中的宝贵业务数据的访问，并要求能够从其他系统方便地进行访问。
There was real need to improve access to functionality and valuable business data residing in existing legacy system and to be able to access it easily from other systems.
IT服务：这些服务通常不包括实质的业务逻辑，而用于提供对现有运营系统的基于服务的访问。
IT services: These typically contain no intrinsic business logic, but are used to provide service-based access to existing operational systems.
较大的替换项目风险很大，开销也很大，只有现有系统不再能满足业务需求时才能进行。
Major replacement projects are risky, expensive, and warranted only when the existing systems can no longer satisfy business needs.
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