In agile development, the idea of precise estimates is unrealistic. But estimates are needed to inform decision-makers about whether it's worth solving a problem as it is currently understood. It sounds counterintuitive, but instead of asking for one estimate of cost and schedule, ask for three. Here's why it's more useful.

Flaky tests could be the result of issues in the code, but more often they are due to assumptions in the test code that lead to non-relatable results. There are many reasons that tests can fail intermittently, and some can be easily avoided by applying good defensive design strategies. It's all about making your code agile.

Docker containers are launched using Docker images, which are built from layers of Dockerfiles. A Dockerfile is a text document that contains all the commands or instructions to create, copy, and run an image. Let’s look at what goes into creating a Dockerfile, which could be used to build a runnable Docker image.