Whilst implemented at the end of projects, it is advisable to start early and engage with all teams involved to ensure UAT is on the radar and considered in their planning. Often, departments consider the challenges
and defects that will arise but do not realize that UAT identifies defects for
fixing and overcoming.
When determining timescales, you also need to consider where resources will need to be implemented and the overall strategy which the UAT is being implemented to achieve. Part of the planning process will involve determining why the project is being carried out and the benefit which the organization is hoping to gain from the change.
Once the benefit is realized, it must be effectively communicated to all UAT participants, so they understand what they need to be looking out for whilst testing to achieve success.