Taking into account the drawbacks presented above for each asset in the PABRE framework, the objectives of this thesis are: 1. Do a systematic review of the existent published works on reuse in Requirements Engineering stage, particularly on the use of patterns to achieve the reuse of requirements during Requirements Engineering. 2. Construction of a complete set of non-technical SRP that can be obtained from the Software Requirement Specifications (SRSs) corresponding to 6 real projects. 3. Study of the Content Management System domain and construction of some examples of functional SRP for this domain from the same 6 SRSs. 4. Check the validity of the current SRP metamodel for its suitability for non-technical and functional SRPs. 5. Validate the structure of SRPs (as it is the base of this thesis) and construct a survey which will be used to know what requirements engineers think about the usability of SRP catalogues in real projects in their different enterprises or organizations and if it will be applicable or not.