Updates maas-overview.md

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maas-alliance · Oct 4, 2018 · 895bfa3 · 895bfa3
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 Mobility as a Service is built on the principle of **service**. In our context, service means **meeting human needs**. We also have a commitment to **offer quality and promote sustainability.**
 
+## Technical overview
 
+In order for MaaS to become reality, we need layers of technical infrastructure to support single- or multi-modal journies that span cities, regions, nations, continents, and possibly the globe. In other words, **we cannot work in isolation**.
+
+By way of example, consider the following diagram showing some of the technical layers and data interchange needed to support a person when taking a multi-modal trip:![](/resources/multi-modal_user_journey_data_flow.png)In the above abstraction, we can see there are many moving parts involved in efficient trip planning. execution, and reconciliation.