Towards a new metamodel for the Task Flow Model of the Discovery Method
  This paper presents our proposal for the evolution of the metamodel for the Task Algebra in the Task Flow model for the Discovery Method. The original Task Algebra is based on simple and compound tasks structured using operators such as sequence, selection, and parallel composition. Recursion and encapsulation were also considered. We propose additional characteristics to improve the capabilities of the metamodel to represent accurately the Task Flow Model. 
Carlos Alberto Fernandez-y-Fernandez
cs.SE