Subsequent objectives may change over time. For instance, an objective for someone with a young family is to have a position that doesn't negatively impact family responsibilities. Later in life, an objective may be increasing your scope of responsibilities within the company. Properly defining objectives can focus responses to questions about the value you can bring to a new position. Thirdly, people too frequently accept the set of alternatives offered rather than create new alternatives.
Some constraints are real, but some are only assumed.
An assumed constraint is mental. To break it, try assuming that a constraint doesn't exist and create alternatives that reflect its absence. If the result is attractive, maybe there is a way to make it happen. The fourth shortcoming lies in not recognizing invisible factors, on circumstances generated elsewhere. If the market is not buying the company's products, this could create problems for individual engineers.