Enforcing child records
110046
Mandatory child record when creating parent record
80784
Children with a different surname to parent - UK citizen - UK passport control
110337
Prevent griefing
133175
error: SELF_REFERENCE_FROM_TRIGGER while updating child records
70504
apex record sharing with and without manual rowcause
142089
Stricter  usage rules
115812
Allow locking of answers
143514
How to perform Global search on account hierarchy to display related records
132750
Better defining a parent-child relationship on a table
59484
Enforcing / Securing POST parameters
21141
Finding if which users have a record type available to them using SOQL
67875
A timestamping authority (digital notary)
98578
Warehouse: Store (and count) non-fact records?
27381
Object child of two parents
11344
prevent the deletion of account records if they have oppurtunity
74389
Iterating over related records in visualforce using standard controller
137470
How to restrict anonymous users to a single product and quantity 1 using Commerce and Rules?