A method to measure quality of experience of a video service, said video service being over-the-top video streaming provided to a user application under request by means of a network, wherein the method comprises: - calculating a Key Performance Indicator, or KPI, from measurable network parameters of said network for each video provided by said video service, assigning a Key Quality Indicator, or KQI, to each KPI by means of analytical models and calculating a global KQI function of a set of KQIs, wherein said KPI is an interruption rate, said interruption rate indicating number of interruptions or breaks during a video playback time; characterised in that it further comprises: - considering that a first interruption has occurred after the start of a playback of a video in said user application if the following condition is given: B t < r ⋅ t - T 0 where B ( t) is the time-depending evolution of received bytes of said video in said user application; t is the time variable; r is the video bitrate; T 0 is the initial buffering time needed to acquire an initial volume of bytes B 0, wherein B 0 = r · τ 0, and wherein τ 0 is an initial playback time specific to each video player; - considering an interruption during said playback of said video after n interruptions occurred if the following condition is given: B t < r ⋅ t - T 0 - ∑ i = 1 T i wherein n is the number of interruptions that previously occured during playback of said video up to time t; and T i is the duration of each interruption, said duration being the time needed to buffer B 0 bytes; and - calculating said interruption rate for said video according to the following formula: KPI = N int d where KPI is the Key Performance Indicator referred to said interruption rate; N int is the total number of interruptions that occurred during said playback of said video; and d is the duration of the playback of said video, wherein d = T end - T start, T end being the instant of reception of the last video data packet and T start being the instant of the video request. - calculating a Key Performance Indicator, or KPI, from measurable network parameters of said network for each video provided by said video service, assigning a Key Quality Indicator, or KQI, to each KPI by means of analytical models and calculating a global KQI function of a set of KQIs, wherein said KPI is an interruption rate, said interruption rate indicating number of interruptions or breaks during a video playback time; - considering that a first interruption has occurred after the start of a playback of a video in said user application if the following condition is given: B t < r ⋅ t - T 0 where B ( t) is the time-depending evolution of received bytes of said video in said user application; t is the time variable; r is the video bitrate; T 0 is the initial buffering time needed to acquire an initial volume of bytes B 0, wherein B 0 = r · τ 0, and wherein τ 0 is an initial playback time specific to each video player; B ( t) is the time-depending evolution of received bytes of said video in said user application; t is the time variable; r is the video bitrate; T 0 is the initial buffering time needed to acquire an initial volume of bytes B 0, wherein B 0 = r · τ 0, and wherein τ 0 is an initial playback time specific to each video player; - considering an interruption during said playback of said video after n interruptions occurred if the following condition is given: B t < r ⋅ t - T 0 - ∑ i = 1 T i wherein n is the number of interruptions that previously occured during playback of said video up to time t; and T i is the duration of each interruption, said duration being the time needed to buffer B 0 bytes; and n is the number of interruptions that previously occured during playback of said video up to time t; and T i is the duration of each interruption, said duration being the time needed to buffer B 0 bytes; and - calculating said interruption rate for said video according to the following formula: KPI = N int d where KPI is the Key Performance Indicator referred to said interruption rate; N int is the total number of interruptions that occurred during said playback of said video; and d is the duration of the playback of said video, wherein d = T end - T start, T end being the instant of reception of the last video data packet and T start being the instant of the video request. KPI is the Key Performance Indicator referred to said interruption rate; N int is the total number of interruptions that occurred during said playback of said video; and d is the duration of the playback of said video, wherein d = T end - T start, T end being the instant of reception of the last video data packet and T start being the instant of the video request.