What is the challenging situation you faced with developer?

According to my experience the most challenging situation with developers is when the bugs you have produced are not producible over their environment . The It will be difficult to covey the exact bug . It becomes more difficult when the T and D are in different geographical region . But you can overcome this by right way of communication .
Sometime you will find a mismatch between T and D when the priority and severity of the Bug comes into account . But it can also be resolver with proper guidance .

The second question is completely context dependent. You cant say by looking at the % of completion .
The factors which comes into account
>Priority of the project .
>Weather you have good masters in Proj-A or Proj-B . Then you can go for Experience based testing , Agile testing on those to save time .
>Sometime Relationship with your client .
>Company policies .

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