Abstract : This article introduces the Complexity of Interaction Sequences model (CIS). CIS describes the structure of interaction techniques and predicts their performance in the context of an interaction sequence. The model defines the complexity of an interaction technique as a measure of its effectiveness within a given context. We tested CIS to compare three interaction techniques: fixed unimanual palettes, fixed bimanual palettes and toolglasses. The model predicts that the complexity of both palettes depends on interaction sequences, unlike toolglasses. CIS also predicts that fixed bimanual palettes outperform the other two techniques. Predictions were tested empirically with a controlled experiment and contrast with previous studies. We argue that, in order to be generalisable, experimental comparisons of interaction techniques should include the concept of context sensitivity.