Spotting an ISFJ can be done by observing their behavior, preferences, and characteristics. Here is a detailed description of an ISFJ:

1. Introverted (I): ISFJs are typically reserved and prefer to spend time alone or with a small group of close friends. They may appear quiet and reflective, often needing time to recharge their energy by being alone.

2. Sensing (S): ISFJs are detail-oriented and rely on their senses to gather information. They pay close attention to their surroundings and are observant of the physical world. They prefer practical and concrete information rather than abstract concepts.

3. Feeling (F): ISFJs make decisions based on their personal values and emotions. They are empathetic and considerate of others' feelings, often putting the needs of others before their own. They strive to maintain harmony and avoid conflict.

4. Judging (J): ISFJs prefer structure and organization in their lives. They like to plan ahead, follow schedules, and complete tasks in a timely manner. They are often seen as responsible and reliable individuals.

5. Empathy and Compassion: ISFJs are known for their deep empathy and compassion towards others. They are highly attuned to the emotions and needs of those around them, often going out of their way to help and support others.

6. Strong Sense of Duty: ISFJs have a strong sense of duty and responsibility. They take their commitments seriously and are dedicated to fulfilling their obligations. They are reliable and dependable individuals who can be counted on to follow through on their promises.

7. Attention to Detail: ISFJs have a keen eye for detail and are meticulous in their work. They are thorough and methodical, ensuring that everything is done accurately and precisely. They often excel in tasks that require attention to detail and precision.

8. Preference for Tradition: ISFJs value tradition and tend to adhere to established norms and customs. They find comfort in familiar routines and may be resistant to change. They appreciate stability and prefer to maintain a sense of continuity in their lives.

9. Modesty and Humility: ISFJs are typically modest and humble individuals. They do not seek attention or recognition for their accomplishments and often downplay their own abilities. They prefer to work behind the scenes and support others rather than being in the spotlight.

10. Strong Memory: ISFJs have a strong memory for details and facts. They can recall past events and information with great accuracy, which makes them reliable sources of information.

It's important to note that while these characteristics are commonly associated with ISFJs, individuals may vary in their expression of these traits. Additionally, it's essential to remember that personality types are just one aspect of a person's identity, and everyone is unique in their own way.