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In the development of the ATLAS Trigger and Data Acquisition (TDAQ) software, the iterative waterfall model, evolutionary process management, formal software inspection, as well as lightweight review techniques are applied. The long preparation phase with a geographically widespread team required that the standard techniques be adapted to this HEP environment. Special emphasis is given to the testing process. Unit tests and check targets in nightly project builds form the basis for the subsequent software project release testing. The integrated software is then run on computing farms that give further opportunity for gaining experience, fault finding, and acquiring ideas for improvement. Dedicated tests on a farm of up to 1000 nodes address the large-scale aspect of the project. Integration test activities on the experimental site include the special purpose-built event readout hardware. Deployment in detector commissioning starts the countdown towards running the final ATLAS experiment. These activities aim at understanding and completing the complex system, but also help in forming a team whose members have a variety of expertise, working cultures, and professional backgrounds.
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