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Costa, J. C. . Essential boundary and interface conditions in the meshless analysis of shells. 2015. 63 p. Thesis (Doctorate) Escola Politécnica da Universidade de São Paulo, São Paulo, 2015. Meshless methods provide a highly continuous approximation eld, convenient for thin structures like shells. Nevertheless, the lack of Kronecker Delta property makes the formulation of essential boundary conditions not straightforward, as the trial and test elds cannot be tailored to boundary values. Similar problem arise when di erent approximation regions must be joined, in a multi-region problem, such as kinks, folds or joints. This work presents three approaches to impose both kinematic conditions: the well known Lagrange Multiplier method, used since the beginning of the Element Free Galerkin method; a pure penalty approach; and the recently rediscovered alternative of Nitsche's Method. We use the EFG discretization technique for thick Reissner-Mindlin shells and adapt the weak form as to separate displacement and rotational degrees of freedom and obtain suitable and separate stabilization parameters. This approach enables the modeling of discontinuous shells and local re nement on multi-region problems.