This comes after the tips for exit rules for a reason: Exits are far more important than entries. A typical entry rule could be worded like this: “If signal A fires and there is a minimum target at least three times as great as my stop loss and we are at support, then buy X contracts or shares here.”
Your system should be complicated enough to be effective, but simple enough to facilitate snap decisions. If you have 20 conditions that must be met and many are subjective, you will find it difficult (if not impossible) to actually make trades. In fact, computers often make better traders than people, which may explain why most of the trades that now occur on major stock exchanges are generated by computer programs.
Computers don’t have to think or feel good to make a trade. If conditions are met, they enter. When the trade goes the wrong way or hits a profit target, they exit. They don’t get angry at the market or feel invincible after making a few good trades. Each decision is based on probabilities, not emotion.