3. Why do more than half of enterprise application projects exceed budgets, deliver less than expected benefits, or experience overruns?

The correct answer to this open question is the following.

More than half of enterprise application projects exceed budgets, deliver less than expected benefits, or experience overruns due to the following reasons.

These projects many times lack proper planning and preparation, underestimating basic factors such as finances, forecasting, budget, internal and external conditions, political and economic factors. When the budget is not properly developed, the underfinancing of the project is a common result. The project director has to be very aware of the correct cost estimation to calculate the money that is going to be needed during the whole life of the project, from the beginning to the end.

Risk management is another factor that always is unseen by many companies. And when undesirable things happen, the company is not protected to face the contingencies.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."