The draft Investigatory Powers Bill was published by the Government on 4 November 2015. Ministers have been clear that the intention of this Bill is to consolidate and clarify existing legislation on the interception of communications and the acquisition of communications data and to modernise the law in the light of developments in communications technologies, in order to maintain the operational capabilities of law enforcement agencies and the intelligence and security services. Previous attempts to legislate in this area have met with criticisms over the lack of consultation with communications service providers (CSPs) on matters of technical feasibility and cost. In our inquiry we have focused on technological aspects of the draft Bill in order to identify the main technological issues involved and how these might affect the communications businesses that will have to collect data and cooperate with the security authorities. If law enforcement agencies and the intelligence and security services are effectively to combat terrorism and serious crime, they must have the means to keep pace with developments in communications. They will doubtless need to continue to deploy a range of methods for intercepting and acquiring information about communications. The evidence we have received suggests there are still many unanswered questions about how this legislation will work in the fast moving world of technological innovation. It is essential that the integrity and security of legitimate online transactions is maintained if we are to trust in, and benefit from, the opportunities of an increasingly digital economy.