The article introduces the "multiple-probe" technique, a combination of multiple-baseline and probe procedures, designed to thoroughly analyze the relationship between an independent variable and the acquisition of a successive-approximation or chain sequence. This technique addresses four key questions: initial performance levels, the impact of providing sequential opportunities to perform each step before training, the effects of training, and the performance of remaining steps as criteria are met. The technique features initial and additional probes for each step, as well as true baseline sessions just before introducing the independent variable. It offers an alternative to continuous baseline measurement, which can be reactive, impractical, or assume stability. The article provides a detailed application of the multiple-probe technique to a training sequence for a mentally retarded spina bifida child using crutches, illustrating how it can establish a functional relationship between the independent variable and behavior change. Additionally, it discusses the technique's use as an alternative to continuous baseline measurement in various contexts, highlighting its practical and theoretical advantages.The article introduces the "multiple-probe" technique, a combination of multiple-baseline and probe procedures, designed to thoroughly analyze the relationship between an independent variable and the acquisition of a successive-approximation or chain sequence. This technique addresses four key questions: initial performance levels, the impact of providing sequential opportunities to perform each step before training, the effects of training, and the performance of remaining steps as criteria are met. The technique features initial and additional probes for each step, as well as true baseline sessions just before introducing the independent variable. It offers an alternative to continuous baseline measurement, which can be reactive, impractical, or assume stability. The article provides a detailed application of the multiple-probe technique to a training sequence for a mentally retarded spina bifida child using crutches, illustrating how it can establish a functional relationship between the independent variable and behavior change. Additionally, it discusses the technique's use as an alternative to continuous baseline measurement in various contexts, highlighting its practical and theoretical advantages.