The research results presented in this document represent the deliverable D3.21: “Framework to design and implement adaptive security systems” and are the continuation of the deliverable D3.4: “Analysis of key research challenges for adaptive security”. In this deliverable we aim to validate the challenges elicited in D3.4 with practitioners from industry. We also aim to understand how the assets developed by each partner in task T3.5 could be used to engineer an adaptive security system. In this deliverable, we present the results of a survey conducted with security practitioners from industry. The objective of the survey is to acquire the practitioners’ perspective on the application of adaptive security technologies and identify the research challenges that practitioners perceive to be the most critical in adaptive security. We use a reference architecture of an adaptive security system to identify the contributions of the assets provided by each partner. We showcase how the joint contributions of each asset can support some of the maritime transport use case scenarios elicited in task T5.5 Maritime Transport.