We use the fruit fly Drosophila as our model organism to discover how the complex machinery linking cell adhesion to the cytoskeleton works, and contributes to morphogenesis. We are seeking to discover how adhesion receptors form contacts of differing strength and longevity, at one point mediating dynamic attachments as the cell moves, and at another point stable connections essential for the functional architecture of the body. At these stable sites of adhesion, such as the integrin-dependent attachments of the muscles, genetic changes to intracellular proteins that work with integrins results in partial or complete loss of integrin adhesion. By combining quantitative imaging with genetics we are discovering the rules that govern the assembly of the integrin adhesion complex. To combine biophysical approaches with genetics, we are developing a method of primary cell culture of embryonic muscles, where we can now generate bipolar muscles with integrin adhesions at each end. Of particular interest are the mechanosensitive properties of cell adhesion, where acto-myosin contraction with the cell exerts force on sites of adhesion, causing the recruitment of proteins like vinculin to strengthen adhesion. Cell-cell adhesion is regulated by dynamic microtubules, and we have discovered that a novel adhesion subcomplex controlled by microtubules is required to maintain the segmental boundaries that are crucial for the generation of the pattern within the embryonic epidermis.