This law section defines key terms used in a chapter that involves city and county planning. An "affected city" is one where planning changes are being considered nearby. An "affected territory" is a piece of land outside city limits that's part of proposed planning actions. A "proposed action" means changing plans or zoning rules but doesn't include immediate changes made by specific ordinances. A "planning review area" is the land covered by a city's or county's general or specific plan, limited by the city's influence, a mile radius outside city limits, or an area agreed upon by the city and county.

This law section allows a county and a city in California to set up their own process for sharing and commenting on proposed actions. If they don't make their own agreement, they must use the processes outlined in this chapter.

If a city wants to get input from a county, or a county wants input from a city concerning planning matters, they need to provide a map or similar document. This document should show the specific area within the county or city that they are focusing on for planning review.

This law states that before making a decision on a proposed action, a county must inform each city that will be affected. Similarly, before a city council makes a decision, it must inform the county. This is done following specific procedures outlined in other sections of the law.

This law section requires that counties and cities notify each other when they are planning a public hearing about a proposed action. The notification must include all the details found in the public hearing notice and must be delivered by first-class mail or by hand. Additionally, it should state the earliest date when either the board of supervisors or city council can make decisions about the proposal.

This law states that when a county or city wants to take a specific action, they must give a related city or county 45 days (or a longer period, if agreed upon) to review the action and provide comments or recommendations about whether it fits their zoning rules and plans. If the comments aren't provided in time, the county or city can proceed without them. If comments are given before the planning commission decides, the commission must consider them.

Before making a decision on a proposed action, the county must review feedback and suggestions from affected cities. Similarly, cities must consider input from the county.

When a board of supervisors or city council changes a proposed plan and sends it back to the planning commission for further review, they must also inform any city or county that will be affected by these changes. This is done to ensure that every relevant local authority is aware of the modifications as outlined in related sections.

This law section explains how modifications to a proposed action are handled in terms of referrals to cities or counties. When a proposed modification is referred, cities or counties have 25 days, or more if allowed, to review it and provide comments about its alignment with local plans and zoning laws. If they don’t respond in time, the board or council can proceed without their input.

If responses are received before a planning commission's decision, the commission must consider them. If the planning commission doesn’t make a decision, the modification might go ahead without considering the feedback, as allowed by other legal provisions.

Before making changes, the board of supervisors must review feedback from each city involved, and the city council should look at the county's feedback.

If a county or city wants to change a zoning rule, they don't have to check with neighboring cities or counties, as long as the change matches the long-term general plan that was already shared and approved.

This law says that if the procedural steps outlined in this chapter aren't followed, it doesn't invalidate any proposed actions. In other words, not following the rules exactly won't stop something from moving forward legally.