This chapter introduces the issue of who is able to act as a claimant in a collective redress action - who has ‘standing’. Section 2 addresses potential agency issues with respect to aforementioned two basic approaches of legal standing design. It deals also with the question whether differing rules on legal standing in collective actions versus collective settlements are appropriate. Section 3 assesses the topic of legal standing under the model rules and section 4. assesses the topic of legal standing in collective redress at the EU level: two EU initiatives to guide the discussions on collective redress design within the Member States will be briefly discussed. Finally, section 5 deals with parallel actions, both in the national context and in cross-border EU setting: the design of legal standing rules in collective redress has an immediate effect on the frequency with which potential parallel, competing or overlapping collective actions occur.