<qa>  What is the name of the new tool that can help in achieving NIV initiation?Finding the individual high-intensity setting leading to sufficient improvement in objective physiological parameters is challenging in this group of patients. This process therefore probably requires more frequent and more intensive monitoring. At home, the investigators will optimise monitoring of the patients with the use of frequent non-invasive monitoring of gas exchange with transcutaneous measurements SenTec DM, Software V-STATS 4.0; SenTec AG; Therwil, Switzerland. Secondly, analysis of data read from the ventilator software Respironics Trilogy 202, Philips, the Netherlands will be used to provide information about compliance and the actual provided ventilation. Finally, the investigators will aid measurements of respiratory muscle activity by means of surface electromyography EMG as a relatively new tool which can aid in optimising NIV initiation. Surface EMG is a new tool that might help to optimise NIV initiation. It has been shown that especially high-intensity NIV is able to unload the respiratory muscles Duiverman, work in progress.This might importantly add to the achievement of clinical relevant benefits. Until now, no studies have used non-invasive measurements of respiratory muscle unloading to optimise initiation of NIV. In the last decade, I have developed and validated a surface EMG technique for use in COPD patients, measuring respiratory muscle activity as a surrogate of respiratory neural drive and thus muscle loading. As this method is non-invasive, it can easily be applied at home. Furthermore, surface EMG can be used to asses patient-ventilator asynchrony PVA. Especially with higher inspiratory pressures andor high breathing frequencies PVA may arise.PVA is important as it leads to increased work of breathing, decreased patient comfort and less effective ventilation. During the traditional in-hospital NIV initiation, one might suggest that an indication of respiratory muscle unloading and patient-ventilator synchrony is received through observation of the patient. However, observation by the respiratory nurses is mostly of limited time and detects only events leading to a huge excess of respiratory muscle loading, such as during severe PVA. During home initiation, direct observation is far less easy and less frequent. In concordance with a recent study showing that parasternal EMG can be used to assess PVA in a mixed group of patients initiated on home NIV, the investigators have shown in a recent pilot project that also our surface EMG is feasible to measure respiratory muscle unloading and detect PVA, of note, during different settings, also high-intensity NIV submitted work. As the use of surface EMG for optimising NIV initiation is relatively new, the investigators will extend the monitoring of patients in both groups including surface EMG as a surrogate marker of respiratory muscle unloading and to detect PVA during NIV. 