Understanding Simple Logic

The following assumes you have already learnt about AND OR logic but have not fully understood.

Visual Representation

Imagine if you will a set of ladders that is secured by 2 chains to a wall.

The first chain is cut into several pieces. This chain is then joined by locks. Each lock can be opened by an authorized ladder user. If we ignore the second chain for a moment, then since user A or user B or user C etc. can release the chain this equates to a logic OR function.

The second chain is only cut in one place and only one lock is fitted. The key holder is the person responsible for ensuring the ladder is safe e.g. safety officer. For the ladder to be released a user and the safety officer must both remove the locks, this equates to the logic AND function. Note in this instance we are only considering one user lock