(productive, negotiated, reciprocal, or generalized) provides a description of the exchange task. The task features are defined by the degree of interdependence (separability of tasks) and shared responsibility between partners to complete the task. These features influence the strength of the emotion felt. Productive exchanges are interdependent and this high degree of nonseparability generates the strongest emotions. Reciprocal exchanges are separable which reduces the perceptions of shared responsibility. The exchange produces little emotional response, but individuals instead express emotions in response to the asymmetrical transaction. Generalized exchanges do not occur directly, but interdependence is still high and coordination between partners is difficult. Because there is no direct emotional foundation, emotions produced are low. Negotiated exchanges may produce conflicting emotions due to the mixed-motive nature of negotiations; even when transactions are successful, individuals may feel like they had the ability to do better, creating emotional ambivalence. Overall, productive exchanges produce the strongest attributions of emotions, generalized (indirect) exchange the weakest, with negotiated and reciprocal exchanges in between. The attribution of emotions resulting from different exchange modes impact the solidarity felt with partners or groups The different types of exchange (productive, reciprocal, and generalized) also impact the solidarity or identification that an individual will feel with their exchange partners or group. The different exchange types help dictate the target of felt emotions and influences an individual's attachment. Affective attachment occurs when a social unit (partner or group) is the target of positive feelings from exchange; affective detachment (alienation) occurs when a social unit is the target of negative feelings from failure to exchange. Affective attachment increases solidarity. Similar to the attribution of emotion, productive exchange produces the strongest affective attachments, generalized exchange the weakest, and negotiated and reciprocal exchange are in between. One condition for how social (partner or group) attributions can increase solidarity is by reducing self-serving attributions of credit or blame for the success or failure of the exchange. When individuals have group attributions for positive emotions stemming from success, this eliminates any self-serving biases and enhances both pride in the self and gratitude to the partner. However, group attributions for negative emotions stemming from failure do not eliminate self-serving biases, resulting in more anger toward the partner or group than shame in the self. Lawler also proposes that the persistence (stability) and ability to control acts by the exchange partner (controllability) provide conditions for affective attachment by attributing credit