The case study comprises an expert panel, consisting of representatives of actors across the maritime transport chain, combined with a Delphi-survey tool for shorter planning intervals which is a suitable method for a collaborative planning approach. For a better comparison, the different planning approaches and horizons have to be unified to one key figure, e.g. whole container volume or transhipment figure in ports. After unification of the figures, they have to be weighted with the actors’ market share in each segment. The quantitative estimations furthermore have to be enhanced by qualitative statements. To eliminate the high impact of behavioural aspects, such as bounded rationality and thus the asymmetric information along the maritime transport chain, the representatives have to be brought together and moderated by a neutral third. Only in direct discussions an overall picture for planning issues can be constituted. This planning approach not only improves the reflection to the actors’ own internal planning, but also gives evidence to the market on how the whole maritime transport chain expects the future development in container transport and thus expectations to market growth. For further research, advanced analysis of used information sources by the actors and their effects on planning has to be considered.