The document discusses the need for evidence-based, cost-effective, and tailored interventions in health promotion, highlighting the rapid growth of mobile applications and the challenges in testing them. It emphasizes the concept of 'agile science' for quick efficacy testing of commercial apps, showcasing studies that reveal limited utility from the tested apps and the dynamic nature of app updates during trials. The document calls for innovative methods to improve intervention development and emphasizes the importance of adapting to changing requirements while harnessing technology for health improvements.