This thesis is concerned with a special aspect of the application of the ECtHR?s margin of appreciation doctrine: medically assisted reproduction. The main question raised is whether the States can legitimately be granted a margin of appreciation when it comes to the assessment of whether a restriction of the right to private life is necessary in order to protect morality in cases concerning the application of medically assisted reproduction techniques, with a focus on ovum donation and heterologous in vitro fertilisation. The analysis starts with a general overview of the interpretation of the European Convention on Human Rights and the methods and principles used by the European Court of Human Rights. Chapter III attempts to describe, explain and analyse the margin of appreciation doctrine in general. Chapter IV tries to capture the European understanding of democracy. It is necessary to analyse the relationship between the provisions enshrined in the Convention and the goal of promoting democracy, not only to interpret the phrase necessary in a democratic society of Art 8 (2) ECHR, but also in order to assess what restrictions of human rights the Convention allows in order to protect the morality. Chapter V analyses the protection of morality under the Convention. Firstly, the meaning of the notion protection of morals is examined. Fort this purpose the case law of the ECtHR is analysed and contrasted with the values of a liberal democracy. Secondly, the notion necessary in a democratic society with regard to morality is analysed on the basis of the relevant case law. Finally, chapter VI analyses the application of the margin of appreciation to cases concerned with medically assisted reproduction. Firstly, the scope of Art 8 is examined on the grounds of the ECtHR case law. Secondly, the application of the margin of appreciation in these cases is analysed.