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    <p>It sounds to me like each Tool is going to have it's own logic for determining whether PM is required or not. So I would define an IEquipment interface with a couple enums, something like this:</p> <pre><code>public enum RecurrenceType { //Values } public enum RecurrenceFrequency { //Values } public interface IEquipment { bool IsPMRequired(); RecurrenceType RecurrenceType { get; } RecurrenceFrequency RecurrenceFrequency { get; } //You may want to choose something other than object, or eliminate this property object RecurrenceValue { get; set; } } </code></pre> <p>Then each type of equipment would implement the interface, and the logic to determine whether or not PM is required could be implemented:</p> <pre><code>public class Tractor : IEquipment { public bool IsPMRequired() { //Implement logic here specific to a Tractor throw new NotImplementedException(); } public RecurrenceType RecurrenceType { get { throw new NotImplementedException(); } } public RecurrenceFrequency RecurrenceFrequency { get { throw new NotImplementedException(); } } public object RecurrenceValue { get { throw new NotImplementedException(); } set { throw new NotImplementedException(); } } } </code></pre> <p>Then your logic to use these objects would be something like:</p> <pre><code>List&lt;IEquipment&gt; equipment = new List&lt;IEquipment&gt;(); //Populate equipment List&lt;IEquipment&gt; display = equipment.Where(e =&gt; e.IsPMRequired()).ToList(); //Display the equipment that needs PM </code></pre> <p>It might also make sense to have a base class for Equipment where you put common method/property definitions.</p>
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    1. POImplementing non-date driven recurrence
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    1. COWhat's the purpose of the enums if each subclass already has to provide the `IsPMRequired` method? _If_ some specific implementation of the method requires such helpers, then define them for that class; but on the general case they don't seem justified.
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      1. USEdurne Pascual
    2. CO@herenvardo - I'm sorry you feel that way. :) Joking aside, the enums are simply properties that provide additional information about the type. This information can be useful in areas other than IsPMRequired. For example, if you are iterating through a List<IEquipment>, you will not know the type without testing it first, but you WILL know the RecurrenceType, RecurrenceFrequency, etc, because they belong to the interface.
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    3. COI have to admit that I'm not sure why I'd have multiple enums, can you explain your thinking? In my mind RecurrenceType would be something like Days or Uses. Then I'd just need RecurrenceValue to be the 'count.' So to have a PM cycle every 90 days, I'd have RecurrenceType.Days and RecurrenceValue = 90.
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