The workshop will host a number of discussion topics covering experimental, application, and theoretical developments of R-matrix. The aim of the workshop is to bring together a diverse group with representatives from experiment and theory who utilize the R-matrix formalism for a variety of purposes. Sessions will be divided into different specialty topics ranging from nuclear astrophysics applications to mathematical theory to data evaluations. A major goal of the workshop will also be to compare different implementations of the theory in analysis codes and discuss different uncertainty analysis methods. While the workshop is largely targeted at specialists in the field, researchers from astrophysics or other applications that use nuclear physics inputs, as well as students and post-docs, are also highly encouraged to attend.