If u r thinking about any application point of view, the

basic risks would include the following :

1. Critical Defects may be found @ later stages of Testing.

2. Time and Schedule is important concern.

3. If it is a New Application for which u r writing Test

Plan, the Risk may be like QA resources are still learning

the application and may need more time to find critical

defects.

4. Modules with Low risk may be not be tested @ later

levels.

Their r many risks to point out if u r writing a Test Plan

for an Enhancement related to a Product.