Final answer:
The principal should first guide the team to define the desired outcomes of the plan in clear and concrete terms to ensure success in integrating technology and instruction.
Step-by-step explanation:
To best promote a successful effort in developing a plan to improve the school's integration of technology and instruction, the principal should guide the team to take the action of defining the desired outcomes of the plan in clear and concrete terms first. This initial step ensures that all stakeholders share a common vision and understand the goals they are working towards. It lays the groundwork for subsequent decisions, such as determining roles, brainstorming procedures, and analyzing available resources. By having a solid framework of intended outcomes in place, the team can align their efforts and measure progress effectively, thus enhancing the chances for the plan's success.