When you form a new team or start a new project where there are some team changes it is important to allow 2 – 3 weeks for the team to settle depending on the size of the project and team.
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It is important to take this into consideration when estimating the effort and delivery expected for a new project.
What you have to do is to just work it in as project setup time, so you do notfall into the trap of over promising and under delivering on your project, whether it be an internal project or for a client.
Environments need to be setup, new technology needs to be researched, and some training for new people might be required. This allows time for mini-spikes to proof technically difficult concepts.
There are many more reasons, but these are some of the important ones we want to highlight.