The paper by Terje Lohndal and Michael T. Putnam discusses the importance of features and exponents in formal approaches to bi- and multilingual grammars. They argue that an exoskeletal approach, which distinguishes between underlying syntactic features and their morphophonological realizations (exponents), is an ideal tool for analyzing data from bilingual and multilingual speakers. This framework can subsume the *Feature Reassembly* mechanism developed by Donna Lardiere, which handles the reconfiguration of features from the first language to the second language. The authors present three case studies involving different languages and language combinations to demonstrate how an exoskeletal approach can be employed without additional constraints or mechanisms. The introduction highlights two foundational questions: whether bilingual grammars can be modeled systematically and constrained, and whether specific architectural changes are necessary for this purpose. The authors argue that bilingual grammars are as systematic and constrained as monolingual grammars and that no architectural changes are needed. They advocate for a theoretical framework that distinguishes syntax and morphology, where morphology happens after syntax and is realizational. The theoretical framework section introduces *Feature Reassembly* and exoskeletal models of grammar. *Feature Reassembly* focuses on the reconfiguration of features from the first language to the second, while exoskeletal models separate syntax and morphology, allowing for a more flexible and unified approach. The authors show that exoskeletal models can accommodate the mechanisms of *Feature Reassembly* without the need for a separate theory or mechanism. The case studies section provides examples of how exoskeletal models can account for phenomena typically addressed by *Feature Reassembly*. These include the L2 acquisition of number marking in Korean and Indonesian, the L2 acquisition of Chinese imperfective markers, and definiteness in Norwegian heritage language. Each case study illustrates how exoskeletal models can capture the complexities of bilingual grammars without the need for additional constraints.The paper by Terje Lohndal and Michael T. Putnam discusses the importance of features and exponents in formal approaches to bi- and multilingual grammars. They argue that an exoskeletal approach, which distinguishes between underlying syntactic features and their morphophonological realizations (exponents), is an ideal tool for analyzing data from bilingual and multilingual speakers. This framework can subsume the *Feature Reassembly* mechanism developed by Donna Lardiere, which handles the reconfiguration of features from the first language to the second language. The authors present three case studies involving different languages and language combinations to demonstrate how an exoskeletal approach can be employed without additional constraints or mechanisms. The introduction highlights two foundational questions: whether bilingual grammars can be modeled systematically and constrained, and whether specific architectural changes are necessary for this purpose. The authors argue that bilingual grammars are as systematic and constrained as monolingual grammars and that no architectural changes are needed. They advocate for a theoretical framework that distinguishes syntax and morphology, where morphology happens after syntax and is realizational. The theoretical framework section introduces *Feature Reassembly* and exoskeletal models of grammar. *Feature Reassembly* focuses on the reconfiguration of features from the first language to the second, while exoskeletal models separate syntax and morphology, allowing for a more flexible and unified approach. The authors show that exoskeletal models can accommodate the mechanisms of *Feature Reassembly* without the need for a separate theory or mechanism. The case studies section provides examples of how exoskeletal models can account for phenomena typically addressed by *Feature Reassembly*. These include the L2 acquisition of number marking in Korean and Indonesian, the L2 acquisition of Chinese imperfective markers, and definiteness in Norwegian heritage language. Each case study illustrates how exoskeletal models can capture the complexities of bilingual grammars without the need for additional constraints.