What are the consequences of a plaintiff failing to prove their cause of action?

What is the test for adding plaintiffs to a proposed class action where the named and proposed representative plaintiff has no legitimate cause of action? (British Columbia, Canada)

Can a plaintiff in a personal injury action commence an action against a defendant in the same action against the same defendant? (British Columbia, Canada)

Can a new action be brought against the same parties in the same cause of action? (British Columbia, Canada)

If a plaintiff fails to prove quantification of their loss by earnings or by capital asset, is that loss quantification quantified or quantified? (British Columbia, Canada)

Does a plaintiff have to prove that the accident caused or contributed to their degenerative changes? (British Columbia, Canada)

What is the liability of a defendant who causes a plaintiff to suffer injuries as a result of their actions? (British Columbia, Canada)

Can knowledge of a cause of cause be used as grounds for cause of dismissal? (British Columbia, Canada)

What is the burden of proving that a party to a child was not aware of the consequences of the child’s parents’ actions? (British Columbia, Canada)

How have the courts in B.C. considered the reasonableness of the actions of a plaintiff’s who was alleged to have failed to follow and adhere to exercise recommendations? (British Columbia, Canada)

What is the burden of proving that a plaintiff acted unreasonably in her actions? (British Columbia, Canada)