**Author details**

Marco António Mexia Arraya Universidade Aberta, Lisboa, Portugal

\*Address all correspondence to: marco.arraya@marcoarraya.com

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

*Onshore? Offshore? How about Firm Coherency? DOI: http://dx.doi.org/10.5772/intechopen.95807*
