PSS are more user-friendly, but are they also increasingly useful?

Five experiments measured user-friendliness and usefulness indicators of different PSS and explored the relations between these two concepts. The findings indicate high user-friendliness across the board, while usefulness was only found in very limited cases and for very limited dimensions (notably Insight and Consensus). The correlations between the perceived user-friendliness and usefulness on different planning qualities reveal that for the self-reported Enthusiasm of participants all user-friendliness indicators have a positive effect. For perceived gains in Insight, only Credibility and Clarity of output have a significant positive effect.