What's multimodal in transportation for you ?

Are you able to put a clear definition on the word "mutlimodal" ? What do you think it involves to create a smooth multimodal network ? The aim of such transformation in the way of traveling is naturally to provide costumers a better experience during their journey, thus, most of the train stations, airports or harbors existing have to rethink their organization, do you those big investments can occurs one day ?
We are looking forwards to know you're vision on the subject, and soon we will add an article about multimodal.